A girl in my Arabic class was called on to translate something, and she was having a terrible time with it. Normally she's pretty good at it. She admitted that tornadoes are her worst fear. The professor called on someone else.
As we were packing up to leave the professor said, "Get to your cars quick and out run the tornadoes", to which I replied, "You're sadistic! This girl just told you her biggest fear is a tornado, and then you tell her to hurry to her car so she can outrun the tornado?"
I get called on more than anyone in the class because I mess with the professor so often, but it's worth it. It's totally worth it. Next class I'm going to tell her I heard the best knock knock joke of all time, but she has to start it. It'll be funny because she won't catch on until she's committed to it