A slightly unsure witness to a car crash kept saying things like, “I think the light was yellow,” or, “I think it was still raining.”

The cross-examining lawyer interrupted, saying derisively, “We don't care what you think. What do you know?”

The harried witness paused for a moment and then replied, “Then I may as well leave the witness stand. Since I'm not a lawyer, I can't talk without thinking.”