My opinion and payback method of destruction would be the following: IF any of them are married, find their wives and sleep with them taking many pictures, then when they find out you say, "you wanted to ride up on my ass so I rode up on yours, your wifes that is". Another idea would be to put a bunch of bird seed in the bed of the truck, then the truck would end up with a s*** load of s***, (no pun intended), just don't park near him. If you can toss a couple of marbles into their mufflers that's always a good one, damn things will rattle around forever, you just have to get them far enough in there, hahaha (oh s*** I love that one). Or the infamous muffler whistle things that you jamb into the mufflers....... Or another wonderful thing that is just so much fun, take out the rubber part of their windshield wipers, they'll never know what happened until they use them and **** up their windshields. Or you could climb under his truck and loosted his oil drain plug a bit, it'll fall out rest of the way on it's own, or you could call the IRS and say that you did some side work for this one guy (his name) and he refused to pay you, remain unanamous (spelling) and they will probably audit his ass. Or you could poor some saline solution into his coffee, if he drinks it, oh that's a good one, toilet bowl fun with that one. OH yeah, if he's a all around tough guy, you could always call up some big ass dude that you know is a bad ass and act like your that guy from your work, call the dude out for say driving like a retard and to meet you (well your friend) at your work after he gets off. Then when your co-worker gets off work this big ass dude is waiting to put a pounding on him, of course once your co-worker sees him he'll be like dude I didn't call you man, and the big dude will be like, don't be a b**** man and whoop his ass if your lucky, at least you could watch your friend squirm...hahahah... ok, that's good for now.......
just some ideas...