there is a secret easter egg in the Boris corpse room on the wall to the right (past the "WHO'S LAUGHING NOW?"). If you walk into it, you'll find out it's a no-clippable spot that once in there, shows a small room with a small mannequin. The player will say "What the heck is this?" as he's never seen it before. apparently, this is TheMeatly, an easter egg of him. he seems to be in different parts of the game as well.