It may knot be, but this is is a good yarn if you want a thread joke:
Two strings walk into a bar, bartender says “Hey we don’t server your kind here, get out.” Outside one of the strings says “ I have an idea, here help me”. The string proceeds to tie himself up and then dishevels the threads at the top of his head and at his feet. The string then walks back into the bar and orders a drink, bartender looks and says “hey aren’t you that string I just threw out?” String says “ No , I am a frayed knot!”
