I used to turn off just the cold water supply (from the basement) to the shower in my bud's beach house when he was using it. I could hear his angry yells 2 stories below!! His brother & I rigged the stairs knowing that sooner or later he'd get pissed, run downstairs dripping wet with a towel wrapped around him to see what was going on. He did just that and his brother yanked on the thin string, causing him to trip on the stairs along with the towel falling off. We laughed and our girlfriends did too. Boy was he pissed!