Two Horses (Mercedes)

A man was going down the road in his Mercedes and it broke down, the man got out and looked under the bonnet, all of a sudden he heard this voice say adjust the carburettor, the man looked round and saw two horses looking at him the one said go on adjust the carburettor, so the man did this and the car started up and away he went. He pulled up at a Pub walked in and asked the barman for a drink and told the about the two horses, the barman said what car have you got the man said a Mercedes, the barman said what colour was the horse that told you what to do the man said the black one, the barman said that's a good job, the white one doesn't know a thing about Mercedes, Fords yes.