Sometimes I tickle myself.
Listening to radio chatter out of boredom, I heard a bus driver call in to his radio dispatcher saying that he had a low coolant warning indicator. The radio dispatcher answered, "Have you checked for any fluid leaks?"
"Yes," said the operator, "I have no fluid leaks, but a few minutes ago there was quite a bit of smoke coming from the transmission."
A long pause ensued, and I broke it by chiming in, "That means it has finished leaking."