When someone is in a bathroom stall, and you throw rounds of wet paper towel into the bathroom stall directed at the occupant. The bombardment works better when a group of participants each throw the wet paper towel together, thus smothering the occupant inside the stall. Some may miss, but the majority will hit the occupant.
"guys, kevin is taking a dump. everyone, grab some tissue and wet it under the sink, we are about to bathroom smother him.."