A guy goes into a restaurant, with his shirt open at the collar, and is stopped by a bouncer who tells him he must wear a necktie to get in.
So the guy goes out to his car and he looks around for a tie and discovers that he just doesn't have a one. He sees a set of jumper cables in his trunk.
In desperation, he ties these around his neck, and manages to fashion a fairly acceptable looking knot and lets the ends dangle free.
He goes back to the restaurant. The bouncer suspiciously looks him over for a few moments and then says, "Well, okay, I guess you can come in. Just don't start anything."
