I own every Nintendo console sans the GameCube, Game Boy Advance SP, Game Boy micro, DS Phat, DSi, and DSi XL, five Pokémon plushies, a Kirby plushie, I sleep with my Kirby and Wobbuffet plushies on a pillow with a Pokémon pillowcase and Mario bedsheets.
I own 17 games for the NES, 26 for the SNES, 15 for the Game Boy, 9 for the Game Boy Colour, 16 for the Nintendo 64, 18 for the Game Boy Advance, 12 for the DS, and currently 0 for the Wii. (I'm getting it tomorrow).
I've beaten Super Mario Bros in around 5 minutes with the use of Warp Zones and 12 minutes without, I've completed the Pokédex in most Pokémon games sans SoulSilver.
I've imported/downloaded Japan-only Nintendo games because I wanted to play them that badly.
I've seen the Mario movie, both the anime one from 1986 and the live action-one from 1993. I own the book "How to Draw Nintendo Heroes and Villians"
I own various DVDs and videos related to Nintendo franchises.