A couple of strings walk into the bar. The bartender looks at the strings and says "we don't serve strings here, get out!"
So, the strings go outside, and still thirsty looking for a way to disguise themselves, one string says
"Tie your end into a knot and unravel and frazzle the end like this" So they tie up the end into a knot and fray out the loose end.
They walk back into the bar and the bartender gives them the stink eye, and suspiciously asks them "you aren't any of those strings are ya? We don't serve strings here."
To which they replied, "no, were a frayed knot".