A stranger walks into a bar and puts a pound coin on the counter and asks for half a pint of bitter. The barmaid asks him whether he would like Guinness or Worthington. The stranger asks for Guinness. Another complete stranger comes into the bar, puts a pound on the counter and also asks for half a pint of bitter. The barmaid immediately pulls half a pint of Guinness. How did she know what the second man, who was completely unknown to her, wanted?
(think in a crooked way for this one)
When the puzzle was originally framed- the cost of half a pint of Bateman's Guiness was priced at precisely one pound, while the same quantity of Worthington was priced at 90p.
The first customer placed a £1 coin on the counter. The second customer placed a 50p coin and five 10p coins on the counter making a total of £1. If he had wanted a Worthington- he would have placed one 50p coin and four 10 coins.