Three strings walk into a bar...

Three strings walk into a bar...

The first string says, "I'll have your strongest beer." The bartender says, "Are you a string?" The first string says "Why, yes, I am." The bartender says, "We don't serve strings here. Get out!"
The seconds string says, "I'll have whatever you've got." The bartender says, "Are you a string?" The second string says "Yeah. Why?" The bartender says, "We don't serve strings here. Get out!"
The third string, seeing what happened to the first two strings, quickly hurries home. He decides to disguise himself. He frays his edges slightly, then ties himself into a knot. He walks into the bar casually. "I'll have your most popular drink." The bartender narrows his eyes, and asks, "Are you a string?" The string replies, "I'm a frayed knot."