With his wife out for the evening, a father was trying to watch TV, but his young son kept coming in and asking for a glass of water.
After the seventh glass, the father lost his temper and yelled, "Go to sleep, I'm watching TV."
"But Dad," he protested, "my room is still on fire!"
Mom: What did you do at school today?
Mark: We played a guessing game.
Mom: But I thought you were having a math exam?
Mark: That’s right.
Once over the hill, I started to pick up speed!