I tend to agree with most of the folks, ya know... the anger passes, maybe just by ranting about it, you can let it go now... but if that anger comes back every time you see that bike locked up... maybe you do have to do something.

A few years ago I had a roommate from hell. She was the roommate that ended all other roommates, I'm now happy to pay 200.00 more for a cracker box that is all mine. So we had finally had the huge blow up... so I moved, on my way out the door, I dropped a frozen but quite raw fish behind the stove... I grin with delight every time I think about what happened as that fish slowly unthawed and began to decompose behind that stove... how long did it take her to figure out where that smell was coming from... how much of a pain in the arse it must have been to move that stove and who she had to get to help her move it... It makes me sooooooooo happy!!

So if you just have to do something -- get yourself a can of sardines and give some inconspicuous parts of his bike a nice rub down with the essential oils of the sea.

At the very least, he'll have to give the ol bike a nice wash down -- OR he'll suffer through it until it slowly wears off, but not before developing a complex. Most likely he'll never figure out it was an act of revenge, just this weird thing that happened.