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."