A guy wants revenge on a taxi driver (reasons not really important) so one night he spots him in the taxi rank.
He walks up to the first taxi in the queue and says, "I don't have any cash, so how about I blow you off in return for a lift into town?" which is (not so) politely declined
He then carries on down the taxi rank offering the same deal to each cabbie... until he reaches the taxi driver in question.
At which point he says, "£20 to take me into town?"
he looked out the back window as they drove off and gave a big thumbs up and a smile at the other cabbies