Two Pieces Of String

Two pieces of string walked into a bar and ordered a pint. 'sorry' said the barman, 'we don't serve pieces of string in here' and with that he threw the two pieces of string out.

Outside, one of the pieces of string ruffeled himself up, tied himself in a loop and went back into the bar.

'Are you one of those pieces of string I just threw out?' asked the barman.

'No' replied the string, 'I'm a frayed not'!