Ha ha.

A horse walks in to a bar and orders a beer.  The bartender is a bit taken aback and asks the horse to hang on a minute.  Meanwhile he goes into the back room where his boss is and says "There's a horse out front asking for a beer - what should I do?" "Serve him" says his boss "but charge him double - horses don't know the price of beer".  So the bartender goes back out and serves the horse his beer.  "We don't get many horses in here" he says.  "I'm not surprised at these prices" replies the horse.