Get a big bucket of water, mix in some lovely things like fish guts, onions, anything that smells, etc... whatever. Put a hole in the bottom, run a hose to under their door while they sleep, empty it out in their room. If you wanted, depending on which way their door opens, you could do the famous clear saran wrap across the door way, as well. I'd do all of the above, plus blasting "Party in the USA" constantly.
