On the occasion of teacher's day, here are some less popular stories from Mahabharat about teachers and their students.
Parashuram and Bheeshm:
Lord Parashuram was the teacher of DevVrata. DevVrata was the only Kshatriya prince ever taught by Parashuram.
Due to a terrible vow of celibacy he has taken, DevVrata becomes "Bheesh
m". When the king of Kashi (modern
When Bheeshm comes at Kurukshetra on his charioteer, he see that Parashuram did not have a chariot. He asks his Guru, "How can I fight with you teacher? I am on a chariot and you are on ground." Parashuram replies that the mother earth is his chariot. Bheeshm gets down from his chariot and then the great fight begans. After a terrible fight, the gods from heaven ask Bheeshm to stop the fight as there was no end to that war, as Bheeshm was capable to defeat his own teacher. Parashuram is pleased with his student and says, "O great Bheeshm, you have made me proud today. But I cannot leave the battlefield" to which Bheeshm replies, "And I cannot disgrace my guru by defeating him so I will leave the battlefield". Parashuram is pleased. He blessed Bheeshm but warns him that he had to pay the debt of the injustice he had brought upon Amba.
Parashuram and Karna:
King Shoorsen had a daughter named Pritha whom he gives to his brother, king of Kuntibhoj (somewhere in modern Madhya Pradesh) who had no child. King Kuntibhoj renamed that girl as Kunti. Once the sage Durvasa comes to Kuntibhoj and he is very pleased with the attendance he recieved from Kunti. He gives Kunti a boon that she can call various Gods from heaven and can get children from them. Excited Kunti tries to experiment that boon and calls God Surya (Sun). At once the God appear and grant him a son born with an aromour and earings attached to his body. Kunti gets frightened as she was still unmarried that time. She puts that child in a basket and throws it in the river 
Great archery teachers like Dronacharya refuse to teach Karna as he was Suta by caste. Karna then goes to Parashuram to learn warfare skills. He knew that Parashuram hates Kshatriyas. He lies that he is a brahmin and begans his education. Parashuram becomes so impressed with Karna that he starts comparing him with Bheeshm.
One day when Parashuram was sleeping with his head on the lap of Karna, a blood sucking insect comes there and starts sucking blood from Karna's thigh. The pain was unbearable for Karna but he still bears it as even a little jerk could disturb his teacher's sleep. When Parashuram wakes up and looks at the blood stained thigh of Karna, he asks him why he didnt defended himself. Karna replies that this could have disturbed your sleep. Parashuram gets furious. He says, "No brahmin can bear such pain. You are definitely a Kshatriya, you lied to me. I curse you that you will forget all what you have learnt when you will need it most"
Kripacharya and Yudhishthir:
Kripa was the chief Guru of Hastinapur, but he was never biased towards any of his student. His sister Kripi was married to Dronacharya, but he was not at all partial like Dronacharya was. He taught martial arts and vedas to the 100 Kauravas (sons of King Dhritrashtras) and 5 Pandavas (sons of younger brother of Dhritrashtra, Pandu whose wives were Kunti and Madri) princes alike. 
Yudhishthir, the eldest Pandav, was the eldest among all 105 brothers. Kripa was very much impressed with his righteousness and his inclination towards Dharma. He later advocated the right of Yudhiishthir to be the king of Hastinapur.
The eldest Kaurav prince Duryodhana however was jealous of his cousins Pandavas and one day he decietfully humiliates them all and their wife, Draupadi. This results in a war between Kauravas and the Pandavas in Kurukshetra. Bheeshm, Karna and Kripa had to fight from the Kauravas side.
Before the war, Yudhishthir goes to all the elders Bheeshm, Dronacharya and 
Kripacharya. Bheeshm bless him, "Victory will be yours Dharmaraj, ask for a boon" Yudhishthir asks, "How can we defeat the mighty Kuru like you who have defeated his own teacher?" Bheeshm replies that "when my time will come, I myself will tell you how will I die". Yudhishthir then goes to Dronacharya for benediction. Drona says, "Victory shall be yours Yudhishthir, ask for a boon" Yudhishthir asks the same question to him. Drona replies "I can only be killed when I will leave my weapons and when I will hear lie from a man who always speaks truth" Yudhishth
ir then goes to Kripa. Kripa says "If you hadnt come to me for benediction, eldest son of Pandu, I would have cursed you with defeat. But I am pleased with you, ask for a boon". When Yudhisthir looks up to his first teacher's face, he suddenly feels ashamed of himself. Tears start gushing out from his eyes. He could not speak more.
The wise Kripacharya realising what he was trying to ask, says, "Dear Yudhishthir, I cannot be slain in this battle. I have to fight from Duryodhana's side and also have to obey the commands of our commander-in-chief because our Dharma says so, and you too should follow your dharma. So go ahead and fight against me. With every rising sun I shall pray for your victory"
In the Kurukshetra war, all warriors defeated their teachers (Pandavas-Drona and Kripa, Abhimanyu-Kritvarma), which ultimately means victory of the teachers. 
For the first ten days, Bheeshm was the commander-in-chief of Kauravas. He did not allow Karna to participate in th
e war under his command as he was suta by caste. Bheeshm created havoc for nine days as he was invincible. On the tenth day, Arjun, the third among the Pandavs, took the shield of Shikhandi, brother of Draupadi, and attacked Bheeshm as advised by Bheeshm himself on the previous night. Shikhandi was actually incarnation of the Kashi princess Amba disgraced by Bheeshm long ago. Bheeshm recognises Amba inside Shikhandi and did not attack him as it was against Kshatriya dharm to fight against a woman. Bheeshm thus paid the debt of Amba as instructed by his teacher and was slain by Arjun.
After Bheeshm's fall, Dronacharya becomes the commander-in-chief and Karna too joined the war. By that time he knew that Pandavas are actually his own brothers but he still had to fight from Duryodhana's side as he was his friend. On the thirteenth day of the war, Drona forms a military formation called Chakravyuh and Abhimanyu, the son of Arjun, is killed mercilessly by six warriors including Drona, Kripa and Karna. Drona himself is killed on fifteenth day.
After Drona's death, Karna becomes the commander-in-chief and decides t
o take on Arjun on 17th day of the battle. A night before he saw his guru Parashram in his sleep. He asks his guru, "O teacher, please relieve me from your curse just for one day" to which Parashuram replies, "The coming day is the only day for which I cursed you. Dear Karna, you have already paid the debt of friendship of Duryodhana by asisting in unjustful killing of Abhimanyu. Now you should accept your own fate".
The next day, Karna fought against Arjun. But suddenly the wheel of his chariot gets stuck in mud. He gets down from his chariot to lift the wheel. Lord Krishna, the charioteer of Arjun asks him to shoot an arrow at Karna, as he had killed defense less Abhimanyu. Karna realising that Arjun is going to slay him tries to call his Brahma-astra but he forgets it on such a crucial time as he was cursed by his guru. Arjun takes out his Anjalika-astra and chops off Karna's head.
On the eighteenth day of the war, Duryodhana is also killed but before dying he makes Ashwattama, the son of Drona, his commander-in-chief. The only three survivors from the Kauravas side were Aswatthama, Kritvarma (Lord Krishna's cousin) and Kripacharya. Ashwatthama plans to kill the remaining army of Pandavas that night. Though Kripacharya pursuades his nephew not to commit such a horrendous act, he finally had to aide him. The three warriors destroy the remaining army of Pandavas while in their sleep and inform it to dying Duryodhana. Only the five pandavas along with Lord Krishna and his cousin, Satyaki survive.
Lord Krishna curses Ashwatthama to wander on the earth forever alone. Kritvarma is forgiven by
Now the question is, what was the learning?
1. Parashuram was a wise and knowledged teacher. He knew that even a Kshatriya like Bheeshm had to pay for his deeds which knowingly or unknowingly had affected somebody else's life. Thats why he fights with him for Amba to show that one of the most important duty of a warrior is to protect the respect of a woman.
2. Parashuram also knew that mighty warrior Karna who lied to him was not aware of the story of his birth at that time but still he cursed him that he will forget his knowledge at the time he will need it most. This is because a true teacher is one who knows his student well. And Parashuram had knowledge that when the war between dharm and adhrama (right and wrong) will happen, Karna may side with adharma.
3. Kripacharya was a wise old teacher. He was accepted by Pandavas as their teacher even after the war and even after being involved in killing of their own sons in the sleep. This is because of the impartiality he showed throughout his life. While he was a teacher of both Kauravas and Panadavas he supported Yudhishthir to become king but while in war, not only he fought fiercely for Duryodhana, he was also involved in killing of Abhimanyu and Draupadi's sons. He was respected throughout for his unbiasness and has been granted immortality. He is believed to be still alive.
Great are the true teachers and greater is the aura of knowledge they emit!!
(pics drawn and story narrated by Mrinal)
