I swear there was a weapon in Hexen II where you fire at a guy then chains just appear out of nowhere, latch onto dude's limbs and tear him apart.
I only ever played the demo (where cheats worked, hence, getting the weapon) years ago, and I can't find a video or anything. Maybe I am misremembering. I now claim this idea if it has not been done before.
I also thought the shrinking ray in Duke Nukem 3D was cool. I seem to remember that bit where you have to shoot yourself in the mirror to become small enough to get through a small gap, then avoid being trodden on until you grow back.
Or maybe I am just making up all kinds of shit this evening?