NES controller turned bicycle reflector
There is no other controller as infinitely moddable as the platonic, perfect design of the original NES joypad: wonderfully angular, its pleasing, barely egonomic symmetry outlined along the edges in red and white. This bicycle-rear NES reflector doesn't do much but use the controller as a case for some scintillating LEDs, but it will — at least — alert velocipedic tail gaters of your Paperboy skills. The man who can best tornados, break dancer, even the Grim Reaper himself is not to be messed with.
Bike Flasher made from NES Controller [Instructables via Hack-A-Day]

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Wouldn't this technically be less of a 'reflector' and more of a tail light?
Either way, it'll be stolen in a couple days easily.
It's velcro'd on, so the owner would be taking it off, but it definitely is a light, not a reflector.
This would be much better if it were a steampunk NES controller tail light. The size of a coffee table.
yes, tail light, not reflector. (sorry, pedantry).