CoH's ragdoll physics. And their complete lack of any resemblance to real physics.
Case in point:
I once was on a mission against the Family, on a Kin/Electric Brute. One of the Kin brute's powers is Repulsing Torrent, which is long ranged, a targeted cone, and delivers ridonkulous levels of knockback, especially slotted for additional knockback. I had fun with it.
One Button Man, he had his back to me, standing around punching his fist. It was an Office map. Above me, a balcony. Ahead, a wall separating the hallway we were in from a breakroom with a vending machine.
I say hello in the form of Repulsing Torrent. Button Man goes flying, gets stuck in the wall for a moment. I run over to hit him, but he pops out of the wall, and somehow gets launched about fifteen feet into the air, onto the railing of the balcony, where he lays for a while, doing about 3 barrel rolls in the process.
He finally comes to 'rest' and starts to get up, but the animation of getting up causes him to fall off the balcony. He lands head-first and gets stuck in the floor, like a cartoon ostrich.
Now, I'm laughing my rear off here, but I have a demonic idea. I didn't let him get up. I decided to launch him at the wall again, using Repulsing Torrent. If you thought it was funny up until now, you haven't heard anything yet.
The Button Man hits the wall and glitches through. The glitching physics squeeze him like a grapeseed out of the other side of the wall, and he careens head-first into the vending machine, positioned just perfectly so his head looked like it had been jammed into the dispenser slot, with his body slumped behind it.
I cackled so hard that I fell out of my chair, and couldn't get to the screenshot key fast enough to screenie it before the mafioso got up, sadly.
Still, I smacked an overdressed goon through a wall and into a vending machine. Consider that one written off my bucket list.