A very drunk man was walking down the street, one foot on the pavement and the other on the road.
“I shall have to arrest you for being drunk,” said the policeman.
“Drunk?” said the man. “How can you tell?”
“You are walking with one foot on the pavement and the other on the road,” replied the officer.
“Oh that’s wonderful” said the drunk, “for a while I thought I had one leg shorter than the other.”