god the world has gotten too techie.what you need is a good, strong, sharp knife with a blade somewhere around 6" long.
use it to deflate his tires.
coat his car in eggs. uncooked, and break the shells. it will royally fuck up his paint job.
pour some sugar in his gas (petrol) tank. lots of it. the more the better. if you can't use sugar, use water.
put a flaming bag of dog poo on his porch.
but man, don't kill his computer just cause HE'S an asshole.
the computer didn't do anything wrong.
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kuru
'dancing is the vertical expression of horizontal desire.'
-robert frost