A driver is stuck in a traffic jam on the motorway. Nothing is moving. Suddenly a man knocks on the window, the driver rolls down the window and asks, "What's going on?".
The knocker replies "Terrorists have kidnapped some MP's who were resting in the Green room at the Houses of Parliament and are asking for a £5 million ransom otherwise, they are going to douse them in petrol 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..."