I have a magical capacity to fall into holes in games - and if there's no hole to fall into, I'll fall into a hole in the code. I've tripped into the endless void through a hole in the map that was never there in Borderlands. I've been shoved through solid objects and into a gap from which there was no escape without fast traveling in Horizon: Zero Dawn. I've died and respawned fused with a bush, immortal but unable to move or progress the encounter in Uncharted 4. But my personal favorite story has got to be the Sacred Icon Loop.
The background: Halo 2's co-op mode is coded in a way that, should Player B be too far away from Player A when Player A crosses a checkpoint, Player B is instantly teleported to their location, and vice versa to an extent. Reasonable, right? Except sometimes, the game gets a bit fuzzy about what 'too far away' is.
There is a level - I seem to recall it was Sacred Icon, although it could have been Quarantine Zone, the level immediately after. In this level there is a passageway with a checkpoint coded roughly in the middle of it - and some rather wonky teleportation code - the practical upshot of which is that when Player A crosses the checkpoint, Player B is teleported right behind them - but should player A move ahead a bit from the checkpoint, when player B crosses the checkpoint, Player A is teleported behind THEM. Rinse and repeat for a while until finally both players either cross the checkpoint at the same time, slowly and deliberately, or the Great Gods of Bungie are appeased by the Divine Loop of Fail and opt to release the players from it. Deities know the exact circumstances.
I've played that level in co-op mode twice, a year apart, and somehow that exact glitch managed to happen both times. It is still the thing I most deeply associate with that thrice-blasted game.
But you wanted screenshots and not just novels. So here, have a glorious moment where somehow, Farkas decided that he just absolutely HAD to get in touch with his Inner Togepi.
(He actually waddled around with that goddamn half-pot for a good chunk of the room. I still have no idea how.)