A driver is stuck in a traffic jam on the highway. Nothing is moving. Suddenly, a man knocks on the window.
The driver rolls down the window and asks, "What's going on?"
"Terrorists have kidnapped Congress, and are asking for a $10 million dollar
ransom. Otherwise, they are going to douse them all in gasoline and set them on
fire. We are going from car to car, taking up a collection."
"How much is everyone giving, on average?" the driver asks.

The man replies, "About a gallon"