OK, so these two stitches walk into a bar, and sit down.  The bartender tells them, "We don’t serve stitches in this bar.  Get out!"

They leave, and go around the corner, where one of the stitches says, "I’ve got an idea."  He unravels himself, untwists his ends a bit, and ties himself into a knot.

The two stitches go back to the bar.  Upon seeing them, the bartender says angrily, "Hey!  Didn’t I just tell you two, WE DON’T SERVE STITCHES IN HERE!"

The stitch replies, "No, no, I’m a frayed knot."

(with sincere apologies to Byron, and everyone else for that matter.)