This one is about horses, but still....

A man was driving across the English countryside and his car stalled.He checked the engine but found nothing wrong.Suddenly he heard: petrol!
He looked around, there was no one except a black horse.He ignored it and kept looking.Then he heard: petrol! once again.
He looked in the trunk, found a can of petrol, poured the petrol into the tank and drove on, stopping by the nearest tavern.
When he told the bartender about it, he answered calmly: Well you were lucky.Usually there's a white horse there and it knows nothing about cars.