Barefoot_Monkey: I like to eschew guns and use the last-resort hand-to-hand weapon. I'm quite infamous by now - in Quake 3 I can often get 30 humiliations by the time the first person gets to 99 frags.

Urb4nZ0mb13: In the RE5 demo, me and my bro play knifean and meleean gaems. Does that count?

Romulus: Back in the heady days of 56k dial-up fragging at speed while playing Unreal Tournament was simply not going to happen. We used a whole host of mods and by accident we invented Rocket Joust.
Using the Dr. Strangelove mod, the player could ride a Redeemer rocket. You could do things like increase its fuel amount, speed or if the warhead was active. We soon realised that deactivating it and flying full speed at each other meant if the other person got hit, they would die from impact damage alone. We downloaded the longest map we could find, it was something like "Alien Hall" and would play this for hours. The skill involved was getting your rocket above the opponent, so you would clip their head with the Redeemer's tip.
Weclock's suicide stunts reminded me of something else too. While playing Vice City we used to find the most hilarious ways of murdering whores. Two of the most amusing ones we came up with was to either land a helicopter on them (which they wouldn't die, but just lay still underneath its skids) and perform all manner actions to finish the job. The other one was to get a whole bunch of them in a car speed towards a cliff and jump out, sending the car plumeting.
Ah good times.

Ois: In a few recent games of TF2, instead of playing Arena matches, we make towers by jumping on each others heads.
This would become more elaborate the higher you get, such as building a sentry, letting it run out of ammo if required, jumping on top of it then causing it to explode, while being healed by a medic. Your character is launched, and has to land on top of everybody else.

Andy_Panthro: we used to see who could make the best lemmings explosion.