Ahhh yes, revenge.
A dish best served cold and without emotion.
Add emotion to the dish and it sours.
Subtle is good.
Cotter pins removed from tie rod ends and a little liquid wrench...........
Electrical crimping pliers applied to front brake hard lines...............
Milk or cream down the heater vents in the cowl..............
Packing peanuts in the gas tank...............
Washers taped to a driveshaft..............
License plates from the same make and model car placed on the marks vehicle..........makes traffic stops fun!
Random "sexy" ads placed in certain areas of Craigslist or Rocky Mountain Oyster with the marks e mail or phone #.............
Membership to certain "specialized" dating clubs and magazines............
Numerous subscriptions to the CD of the month club.............
I have read that all of the above are very effective

But that's what I read..................