Two lengths of strings walk in to a pub. The first string goes to the bar and tries to order some refreshment; the landlord tells him to get out and shouts "I don't serve strings in this pub".
Once outside in the street, the other string ruffles himself up, ties himself in a loose half-hitch, marches back into the pub and up to the bar. The landlord growls, "Hey, didn't you hear what I told your mate?"
The string says "Yeah."
The bartender retorts "Well, aren't you a string?"
The string replies "Nope, I'm a frayed knot..."
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