The Bus

   A woman was wearing a very tight skirt.  When she tried to board the
Fifth Avenue bus she found she couldn't lift her leg.  She reached back
and unzipped her zipper.  It didn't seem to do any good, so she reached
back and unzipped it again.
   Suddenly the man behind her lifted her up and put her on the top step
of the bus.
   "How dare you?" she demanded.
   "Well, lady," he said, "by the time you unzipped my fly for the second
time I thought we were good friends."