If we're gonna do cheesey jokes, here are some favs:

A horse walks into a bar. Bartender asks, "Why the long face?"

A String walks into a bar. Bartender tells the string, "We don't serve your kind here!"
String walks outside, ties himself into a knot and messes up his hair. He turns around and walks back into the bar.
Bartender says, "Aren't you the string that was just in here?"
String replies, "'Frayed knot!"