The best revenge I had read about was when a woman found out her husband was cheating on her. She found he had a packet of condoms for his mistress, so she made a small pin prick hole in the foil packaging of all the condoms, soaked them in tobasco sauce and then dried them out (I assume the condoms were red in colour so they didn't get discoloured). Then when her husband was with his mistress and they got down to it, they both suffered the pain of tobasco sauce to the nether regions...
