The Rubber Van 

A subclass of the 4chan Party Van. It is usually deployed with a crew trained in capturing lunatics and taking them to the nut house aka the Funny Farm.

"Oh, dear, Kimmo's at it again. Has someone called for them to sent The Rubber Van around to collect him?"

"Looks like it's a one-way trip to the nut house in The Rubber Van for him, then!"

The Rubber Van by RTM 1963 November 22, 2021

rubberband on the doorknob

It is literally a rubber band hanging on the doorknob, used to warn a roommate(usually in college dorms) that the other is currently having sex in that room.

If your ever having sex and you dont want your roommate to come in by accedent then just put a rubberband on the doorknob.

rubberband on the doorknob by voodoom August 21, 2006