Okay, this isn't appropriate recourse for the OP's situation, but I did hear a good revenge story about a lady who found out her boyfriend was cheating on her. So she snuck into his apartment just after he left work and dumped a big bagful of dead fish underneath his waterbed mattress. Then she turned the waterbed heat on high and left. Needless to say by the end of the day the smell was dreadful and I'm sure his new girlfriend wasn't too impressed when she made her next visit....
Okay, Okay.......I'm one of those boneheaded DH's that likes practical jokes. However after the DW told me "You have to sleep sometime" I refocused who I pulled jokes on!!!!!!!