Game Lampshade is a bit of an enigma. It's a hack of Game Lamprey and Guards At The Nexus Of All Worlds, and like Game Lamprey it sort of works by deleting material from a tabletop game.
Unlike Game Lamprey, you aren't physically ripping pages out of the game. Instead, you pick a word to 'dim', and then you have to try and talk around it without actually saying it.
Lampshade is definitely a little surreal, but there are absolutely games where a little surreality would enhance the experience. Definitely take a look if you're craving something weird.