59 levels to play before you die: M - S

Resident Evil (GameCube) | The Aqua Ring
In the original Resident Evil, your run-in with the Umbrella Mansion's zombie sharks was brief, mildly frightening and took place in a room that was flooded to about waist height because the sharks had managed to break out of their tank. The Resident Evil GameCube remake features a similar scenario, except that now the "room" is the Aqua Ring, a massive, circular tank built in the middle of a huge observation chamber. And this time, the waist-deep flooding goes up to the chamber's flimsy catwalks, as a school of zombie sharks circle menacingly just underneath. But the king bastard in the room is the massive Neptune, whose shadow you can see far below all the other sharks, and if you don't move your ass, he'll bite it right the hell off:

The key to not ending up fish food here is to move as fast as possible and find a switch to drain the water from the room - but even then, you're not out of the woods. Neptune, seemingly dead, stands between you and a key you need - and once you grab it, he wakes up and starts trying to eat you. It's a frightening thing, having an angry mutant shark thrashing around right in your face, and if you play your cards wrong, well, this happens: