A piece of string went into a pub and asked for a beer.
The barkeeper asked, "Are you a piece of string?"
"yes" said the piece of string.
The barkeeper looked at him sternly and said, "F*** off, we don't serve pieces of string here". So off he wiggled to the next pub.
He went up to the bar and kindly requested a beer.
The barkeeper looked at him suspiciously and asked, "Are you a piece of string?", "yes" was the reply.
"Then piss off, pieces of string are not allowed in here." So off he wiggled out of the pub.
He was wiggling along the road and he stopped at the corner of a building, he tangled himself up into a knot and rub himself against the corner of the building until he was straggled at the edges.
He wiggled his way to the next pub, went up to the bar and asked for a beer.
The barkeeper looked at him and asked, "Are you a piece of string?"
"No, I'm a frayed knot".