A guy walks into a pub with an ostrich and a cat.
 
 The cat and the ostrich go off, find a table and sit down, while
 the guy, let's call him Bob, goes to the bar.
 
 'Pint of bitter for me, gin and tonic for the ostrich and a
 whiskey for the cat please' Bob says to the barman.
 
 The barman think's it's a bit odd but serves the drinks and Bob
 goes over and sits down with the ostrich and the cat.
 
 About half an hour later the ostrich goes to the bar and buys
 the same round of drinks again, a pint for Bob, a G & T for
 himself and a whiskey for the cat. The barman thinks this is even
 stranger, but says nothing and serves the drinks to the ostrich.
 
 This goes on all night, with Bob and the ostrich buying alternate
 rounds of drinks, but the cat never goes to the bar.
 
 At the end of the night the barman can contain himself no longer,
 wanting to know why Bob is drinking with an ostrich and a cat,
 and why the cat never buys a round.
 
 'It's simple really' says Bob, 'I was walking down the street when
 I found a bottle with a cork in it. I removed the cork and out
 popped a genie, who was so grateful to be released that he said I
 could wish for whatever my heart desired, so I asked for a bird
 with long legs and a tight pussy'.