Climbing onto a bar stool, a piece of string asked for a beer.
"Wait a minute. Aren't you a string?"
"Well, yes, I am."
"Sorry. We don't serve strings here."
The determined string left the bar and stopped a passer-by. "Excuse,
me," it said, "would you shred my ends and tie me up like a pretzel?" The
passer-by obliged, and the string re-entered the bar. "May I have a beer,
please?" it asked the bartender.
The barkeep set a beer in front of the string, then suddenly stopped.
"Hey, aren't you the string I just threw out of here?"
"No, I'm a frayed knot."