Stumped!

In some remote village of India, a teacher is reading the Mahabharata to Std VI students. He reaches the part, when Lord Krishna is going to be born.

Masterji: Kansa heard the akashwani that his sister’s eighth child is going to kill him. He was furious. He ordered that Krishna’s parents, Vasudev and Devki, be put behind the bars.

First son is born, and Kansa kills him by poisoning him. Second one is born and Kansa throws him off a mountain peak. Third one is born...”
Now Ramu, who is the smartest of the lot, puts up his hand. “Masterji, I have a doubt,” (sounding nervous and confused).

Masterji: Ramu bete, nobody in the world has a doubt regarding the Mahabharata then how come you have one?”

Ramu: Masterji, if Kansa knew that Devaki’s eighth child was going to kill him, then why the hell did he lock Vasudev and Devaki in the same jail?

Masterji fainted...