We acquired this from an old magician’s estate buy-out. It comes with its original container with the instructions printed on the outside.
This is a real glass (not plastic) that has holes hidden around the edge in the leave patterns. Set one on the breakfast table for your overnight guest. The contents will flow through these holes and will trickle down the chin and shirt-front of anyone who drinks from it. The victims usually think that the fault is their own. They will wipe off their chin and invariably will try again and again. A lot of wet laughs.