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A piece of string walks into a bar and says- A pint of lager please barman.
Barman- I'm not serving you your a piece of string, we dont serve pieces of string here!
The string, determined to get a drink decides to go in the bar the following day and try again but this time in desguise, he ties himself in a knot fluffs his hair up and puts on a pair of shades.
String enters bar - Barman says- Look, I told you once I'm not serving you, your a piece of string! I'm afraid Knot, replies the string!