Space Invaders watch
Ah, but no: it's just an unplayable animation that begins when you push a button. Adds John: "They need to make one that actually PLAYS space invaders."
Brandon is planning to to buy one all the same: "I am perfectly happy with it being sexy and unplayable."
Product Page (Japanese) [Ebten via Gamovr]

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Does anyone remember "Super Mario Brothers" on the wristwatch? Playing it with the watch attached around your wrist proved it to be almost unplayable from memory.
http://www.pressthebuttons.com/2006/07/keeping_time_wi.html