Culinary revenge:
Last year me and a couple of friends swapped over my flatmates salt and sugar. He didnt notice for six months.

In a restaurant that had somehow conned us out of an extra £10 so that we paid 300% for a meal that we had a 25% off voucher for, we used linked straws to siphon vinegar onto the carpet and then coke into the vinegar bottle.

I once retaliated against someone who put salt in my glass of water by going through about £70 worth of spirits and cocktail mixers and adding salt to them.

Me and a friend went through someones collection of professional quality kitchen knives and blunted them by using the sharpening steel in the wrong direction and also by attempting to cut the metal leg off a kitchen table. The knifes had trouble getting through a block of cheese after that and the victim could never work out why.

Throwing peoples belongings out of 3rd story windows is also simple and effective. This was the fate of most of the cutlery owned by the guy with the blunt knives.
( Nimble Colin camera-wrangling, globe-trotting whisky enthusiast, Fri 14 May 2004, 5:12, Reply)