Strings in a bar
These two strings walk upto a bar. The first string walks in and orders and the bartender throws him out and yells "I don't serve strings in this bar!"
The other string ruffs himself up on the street and curls up and orders. The bartender shouts, "Hey, didn't you hear what I told your buddy?"
String says "Yeah."
Bartender says, "aren't you a string?"
String says, "No, I'm a frayed knot..."