Collect game consoles. As of last count:
Odyssey^2, Atari 2600, Atari 7200, Atari Jaguar, NES, SNES, Nintendo 64, Virtual Boy, GBA x2, DS x2, 3DSx1, 3DS XL x2, Gamecube, Wii x2, Sega Genesis, Sega Dreamcast, Sega Game Gear, Sega Saturn, Phillips CD-i (with a bunch of full version demo-unit-only cd games!), Turbographix-16 w/CD attachment (NOT a Duo), PS1, PSOne, PStwo, PS3, Xbox 360, Commodore 64, Neo Geo Pocket.