A driver was stuck in a traffic jam on the M25.

Nothing was moving.

Suddenly, a man knocks on the window.

The driver rolls down the window and asks, “What’s going on?”

“Terrorists have kidnapped all of our MP’s during a sitting of parliament and they’re demanding a £100 million ransom otherwise they are going to douse them all in petrol and set them on fire. We are going from car to car urgently collecting donations.”

“How much is everyone giving, on average?” the driver asks.

The man scratches his chin in quick contemplation and replies, “Roughly a gallon.”