A Manchester United fan and a Chelsea fan collide in a huge accident, on the way to California. Both cars were a wreck, but both men were unhurt.
"This must be a sign from God that we are meant to be friends." says the Manchester fan.
"I agree," replied the Chelsea one.
The Manchester fan then returned to the wreckage and found a bottle of whiskey he had been saving.
"Look," he said to the Chelsea fan, "This must be another sign from God. We should drink this whiskey to celebrate our friendship and survival"
He handed the bottle over to the Chelsea fan, who took a large gulp from the bottle before passing it back to the Manchester fan, who then put the top back on and returned the bottle to his car.
"Aren't you having any?" asks the Chelsea fan.
"No," replied the Manchester fan, "I think I will wait till the police get here."