A story from the epics
Many people tell this story from the Mahabharata. In the magical palace the Pandavas built, the floor looked like water and the water looked like floor. Duryodhana slipped and fell into a pool. In the popular telling, Draupadi laughed and said, "The son of a blind man is also blind." Duryodhana never forgot those words. His anger grew and grew, and became one of the reasons for a terrible war.
This line is not in the oldest text, but the story is told everywhere because its lesson is clear: one careless joke can hurt deeply, and words cannot be taken back.
Source: Mahabharata, Sabha Parva. Draupadi's laugh and the words 'son of a blind man' come from popular retellings, not the oldest Sanskrit text.
