A software tester walks into a bar...

   and orders a beer.
   and orders 3 beers.
   and orders 646516846848 beers.
   and orders 0 beers.
   and orders -1 beers.
   and orders q beers.
   and orders a lizard.
   and orders nothing.
   y ordena una cerveza.
   and orders a deer.
   and orders a beer then tries to leave without paying.
   and starts ordering a beer, then half way through jumps out a window.
   and orders a beer, gets a receipt, then tries to go back.
   and orders a beer, goes to the door of the bar, throws a handful of
      cookies into the street, then goes back to see if the bartender
      still recognizes them.
   and orders a beer, watching very carefully while the bartender puts in
      the order to make sure nothing in the request or payment was missed.
   and orders a beer, trying to trick the bartender into handing over
      personal information.
   and orders a beer while a confederate cuts power to the cash register, to
      see how the bartender reacts.
   and orders a beer while having thousands of robots order a beer at exactly
      the same time.
   and orders a beer on 29th of February to be delivered exactly one year later.
   and orders a from 5 time zones, to be delivered at 12:30am on the day
      when daylight saving changes.
      
Satisfied that testing has been thorough, the engineer signs off and the bar
goes into production.  The first customer walks into the bar and asks where
the bathroom is.  The bar catches fire and burns to the ground.