Paraprosdokians play with double meanings of words. This figure of speech occurs when the latter part of a sentence surprises the first part in an unexpected way. It causes the reader or listener to reinterpret the first part. Often used for humorous or dramatic effect, it creates an anticlimax.
Here are a few:
Do not argue with an idiot. He will drag you down to his level and beat you with experience.
We never really grow up, we only learn how to act in public.
War does not determine who is right - only who is left.
Knowledge is knowing a tomato is a fruit. Wisdom is not putting it in a fruit salad.
Evening news is where they begin with 'Good Evening,' and then proceed to tell you why it isn't.