The limbs. They never end, the limbs. It's like the characters in this glitched out playthrough of Half-Life 2 are related to Slenderman or something.
I've played Super Mario 64 before. Maybe you have too—but you've probably never played it as a horrific corrupted hellscape, like it appears in this glitch run of the game by vinesauce.
Colonel! These nanomachines have me tripping! Heh, this Metal Gear Solid compilation of corruptions and glitches by Vinnie from Vinesauce had me rolling while watching—even though, yes, some of 'em could be something out of a nightmare.
When you purposefully corrupt game, if you're lucky, it turns into something resembling a nightmare. An absurd nightmare full of glitches, that is, not a terrifying one.
Conker's Bad Fur Day is a pretty outrageous game, for something on the N64. But throw in a few glitches and corruptions in there, like vinesauce does, and it becomes particularly ridiculous. Like something out of a nightmare, actually!