Here's another entry from the realm of useless-but-interesting mods: fusing a Game Boy Advance to a Wii, so that you can play Wii Sports and Zelda on those long plane rides. Battery pack, passenger safety equipment not included.
OK -- so really it's just a modder who thought to splice the Wii's video output into a GBA's tiny little display. Nevertheless, science doesn't need a reason to do crazy stuff. That's why it's science!