I worked with a few women who disliked a certain appraiser. They took his coffee cup (which he set in the kitchen for others to wash for him) and washed it, then would pour in the dish detergent and rub it around the inside of the cup. They knew it would give him the runs. The ringleader was in her 60s. Guess I know why I don't work there anymore.
Because you got tired of having the runs? :)