The part of Mahabharata where Yudhishthira solves riddles to save his brother. Utkarsh Patel will talk about this episode 

Any Indian child brought up with a healthy dose of mythology is well aware of the scene in Mahabharata where Yudhishthira is faced with riddles that he must solve to save his brothers, or the trick questions of Vikram and Betal. In fact, such riddles, according to Utkarsh Patel, professor of Comparative Mythology at Mumbai University, have been an integral part of storytelling, be it in mythology or folktales.