A man catching the last train home at night, accidentally fell
asleep and missed his stop.  Upon waking at the end of the line in
the small hours he tried to get a taxi home.  He only had $5 with
him, and the only taxi there told him the fare would be $20.  The
man offered to pay the difference when he got home, but the taxi
driver wasn't having it.  The man spent the night sleeping rough,
and planning his revenge.

The next week the man caught the last train and deliberately stayed
on until the last stop.  The same taxi was parked there, third in a
queue.  The man approached the first taxi and asked how much a fare
to his home would be.

"$20", was the reply.

The man said that he only had $5 on him, but he'd give the driver a
blow-job as well.  The taxi driver swore at him and told him to
leave him alone.  The man then went to the second taxi and did the
same.  He got the same response.  He then went to the third taxi,
the one that was there last time.  Again he asked how much the fare
home would be.  "$20" was the reply.  "Okay" said the man, and got
in.   As they pulled out past the first two taxis, the man smiled
and winked at the two drivers.