The Flatulence Filter, a very effective pillow with a replaceable carbon filter inside that will de-fang the most potent farts.  I know from personal experience that it works!

A couple of mls of the pure aldehyde ended a perfectly good water fight in our lab when I was a graduate student.

It's a great gag gift

Heard about it on a high brow radio program.  It seems that just a drop smells like a 20 pound pile of crap was just smeared all over your nasal passages.  I can't imagine any teenage boy that wouldn't drop his allowance on this stuff.

If you get a ROB who just does not want to disrobe...then just use the bathroom and spray a little around......make their wait for the next victim a little less pleasant.