Hmm... Let's see here:
Game Boy Pocket - works
Game Boy Color - works
Game Boy Advance SP - works
Nintendo DS - Dropped in an aquarium. Sound quality dropped a bit but otherwise no damage. Later on a heavy tray was put on it which caused successively more pixels to turn gray. (Now at about 80%). Only when the light is turned on though, so overall the system kind of still works.
Nintendo DS lite 1 - One of the two areas connecting the top screen with the rest of the system randomly broke one day when playing Guitar Hero: On Tour, resulting in the top screen being completely loose and connected merely through the wires. After some time had passed, the screen went completely white. So we trashed it. Otherwise I would have taken a picture.
Nintendo DS lite 2/3 - works
Nintendo DSi - Minor problems with the L-button at one point, but it solved itself.
Nintendo DSi XL - works
Nintendo 3DS - Same as DSi.
Nintendo 3DS XL - works
NES - works
N64 - works (Reset button is stuck, but it's completely useless anyway.)
Gamecube 1 (black) - Disc reader issues.
Gamecube 2 (silver) - works
Xbox - Power cable got bent, so we trashed it since all good games were playable on the Xbox 360 anyway. Pretty sure that the console itself was fully functional though.
Xbox 360 1 - RRoD
Xbox 360 2/3/4 (same model, though purchased much later) - works
Wii - works
Wii U - works
