Strings

Three strings walk into a bar. The first goes up to the bartender and asks for a drink, to which the bartender replies "I'm sorry, we don't serve strings here." So the second goes up to the bartender and asks for a drink. The bartender replies "Look, like I've just told your friend there, we don't serve strings here." The third string huddles in with his mates and ties them around himself. He then goes up to the bartender and asks for a drink, to which the bartender replies "Listen, I'm sick of you, I've already told your mates twice, we don't serve strings here!" To which the third replies, "Yes, but I'm a frayed knot."

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This is my dad's favourite joke and I've been forced to hear it a thousand times.