While I was roughing in electric in a new home the plumbing contractor was furious that the drywallers were using his plumbing dumping their left over drinks and occasionally as a urinal. After watching repeated encounters over a couple days we came in to see the plumbers smiling like chesser cats. When we asked them what was going on they said that they had decided to use their boxes of screws as urinals before they left on Friday. All the drywallers were happily hanging rock with a mouth full of screws, how appropriate.