[my brother tells this one]
I was sitting behind a car at a stop light the other day and I noticed that it had a bumper sticker that read "Honk if you love Jesus." So I thought about it a bit, and since I loved Jesus, I honked my horn.
I was very surprised when the driver of the car got out and yelled, "The light is still red, you asshole!" got back in the car and drove off through the light which had just turned green.