http://www.englishforums.com/content/humour/paraprosdokians.htmA paraprosdokian is a figure of speech in which the latter part of a sentence or phrase is surprising or unexpected in a way that causes the reader or listener to re-frame or re-interpret the first part. It is frequently used for humorous or dramatic effect. For this reason, it is extremely popular among comedians and satirists.
I asked God for a bike, but I know God doesn't work that way. So I stole a bike and asked for forgiveness.
Do not argue with an idiot. He will drag you down to his level and beat you with experience.
I want to die peacefully in my sleep, like my grandfather, not screaming and yelling like the passengers in his car.
Going to church doesn't make you a Christian any more than standing in a garage makes you a car.
The last thing I want to do is hurt you. But it's still on the list.
Light travels faster than sound. This is why some people appear bright until you hear them speak.
If I agreed with you, we'd both be wrong.
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.
To steal ideas from one person is plagiarism. To steal from many is research.
Always borrow money from a pessimist. He won't expect it back.
-----------------------
More examples:
http://en.wikipedia.org/wiki/Paraprosdokian"He was at his best when the going was good." —Alistair Cooke on the Duke of Windsor
"If I am reading this graph correctly — I'd be very surprised." —Stephen Colbert