Q. What was the immediate cause of the First World War?
A. They killed the Archduck of Austria.
That's good, but here are some of mine:
"He needed to lose weight. He had a 38-inch waste in his pants."
"Sex is not for pleasure. It is for recreation."
I ran a test with a question worded much like that, and got the following answer:
"Someone shot at someone else - and the target resented it."