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In Zelda OoT, I go flying with them.

Final Fantasy XI (the online one) I had just gotten my white mage to level 30, so i went over to the Orc camp by San'Doria. I went almost the entire way to the top of the huge mountain, whacked an Orc, then ran back to the entrance where the level 10 players where. By the time I got there, I had about 100 Orc's after me, my radar screen was filled with red. My character couldn't move I was so swarmed, i think I wiped out all the guys farming for logs.

*w00t* was it san andreas? cool

That's even more fun to do when you're playing Legend of the Four Swords with people who are new to it, start attacking chickens, run into a house and watch them get killed, then run back outside to kill their gems. Me and a friend of mine used to do that all the time. razz

Evil things? Hmmm...would running over your own infantry with your own tanks in Dune 2 be considered evil?
And I remember this really fun thing in Syndicate (does anyone even know this game anymore, God I feel old now razz ). You could persuade poeple to join you with the persuadertron, then have all those people (I'm talking over a hundred here) follow one of your agents and have all of them get into a car. For some reason these cars could hold that many people. Then I'd shoot the car with my other agents until it blew up, which didn't take long for regular cars. The result would be an expanding halo of screaming people on fire erupting from the car until they'd die. About a hundred charred little corpses lying in a neat circle around the burnt out wreck of a car.
And in Oblivion one of my hobbies is turning quest related NPCs into hysterical porcupines by continuously shooting arrows in them, they run around in panic but since they can't die they'll start looking like giant pincushions after a while. razz
A fun little thing to do in Morrowind was to lure a couple of Daedric monsters like Golden Saints and Dremoras after me, take them to a town and watch the guards die in their hopeless struggle against the monsters.
And in Hitman: Blood Money there's a character who wears a necklace with a microflim that you need to retrieve. You can get by with just sedating her and taking the necklace but sick little me always picks up the lighter fluid from the basement of the house to rig the barbecue and watch her burn until her charred corpse falls into the pool before I collect the microfilm. razz

You should try stealing more "militant" vehicles twisted I remember once on gta3, I had a tank... so much blood... twisted

It's fun to run people over in cop cars, ambulances, fire trucks, etc.

In the "Gauntlet" I sit there and keep hitting the guys untill their heads falls off. rofl

In Perfect Dark, while playing teams, I get bored so I get up close with my teammate and a wall and use the granade launcher against the wall. It kills my teammate and I have just commited suicide.

I also like to kill chickens in Ocarina of Time while riding Epona.

Other than that, the most evil thing I ever really do is when I get really bored I make n00bs in WoW paranoid by following them around and skinning all their kills. They get under the impression that you are stealing their loot that they forgot to pick up or something like that.

I make all my sims miserable....hehe.

and in perfect dark i'd love placing denotation bombs on peoples heads and setting them off from a distance.