A guy goes into a fancy lounge wearing a shirt open at the collar, but the bouncer tells him he needs a necktie to get in.
The guy doesn't have a necktie handy, so goes out to his car and gets his jumper cables. He ties these around his neck, manages to fashion a fairly acceptable looking knot, and lets the ends dangle free.
He goes back to the lounge. The bouncer looks him up & down and then says, "Well, OK, I guess you can come in - just don't start anything."
:-)
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