I have a Pac Man watch that I loved dearly as a boy. It got me through many long hours and was loud as hell so when you started up a game you woke up the entire chain gang. Anyway, these retro Nintendo wristwatches come in a crystal clear cubes and make me sooooo happy. There's Famicom D-Pad, Donkey Kong, Ice Climber, and Mario Bros. Now if only they had Dark Tower.
UPDATE - Feh. These aren't playable.
Product page [NCS via Wonderland]