FromSoft should get good at programming, even Dark Souls 2 is unpatchable as fuck, even with all the patch that make the game suck even more than it already has, but the first Dark Souls?, the glitches (or people that use CheatEngine) in that game were comedy gold or just helped you actually progress in the game or fuck other players in PvP, just watch some of them and you'll know what I mean, right?, perfect.

In Youtube:
Mocha Sun-Achieving Euphoria
Mocha Sun-Thirty Skeleton
Oro and Peeve-Dark Souls Pure Black (Coop Playthrough) - Episode 9
Mocha Sun-The Love Guru
Limit Breakers-Secret Stuff / Obscure Mechanics -Dark Souls Shield Guide #2

Or

Any OnlyAfro video

Not easy to answer as it depends on the game physics, but just some 'thoughts'.

Let's imagine the engine is using an engine with physical details, like inertia: SO you kill somebody, does it mean the dead body looses its inertia, no. You just program the physic engine to do, what it is expected to do, use inertia.

Another one, you have altidue in your game (but no inertia, or inertia is 0), what does it mean? In the worst case a flying corpse ;)

Just some examples.

For all those example, to make it easy, you would need to program exceptions, and I mean for ALL!!!! Killed when flying, killed when running, killed when being pushed, killed.........

Or setting inertia to 0, when being kliied......oooops, now you just created the flying corpse, or better to say hoovering corpse...... ;)

Lord of the Rings Online, 2 goblins in Moria were, well, having a really good time

Every waking moment of gameplay in Just Cause 2.

Played some Fifa again...

I have no idea what happened, but the match got completely bugged.
https://www.youtube.com/watch?v=F9zbDU6kouY


And another one, this time our players got stuck at idle animation allowing the opponent's keeper to score a goal against us...
https://www.youtube.com/watch?v=68ZQPZsqR40

The attached achievement was probably not really earned in my case :)

(Game is usually about 5-6 hours)