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 his window and asks, “What's happened?”
“Terrorists have kidnapped Gordon Brown and are asking for a £10 million ransom, otherwise they are going to douse him with petrol and set him on fire. We are going from car to car to take up a collection.”
“How much is everyone giving on average?”
“About a litre.”
Ha ha ha! If only...