The most useless peripheral you've seen.

[smearyllama]

Mine would be GameBoat. It's really, really stupid, and can be viewed here.
(Read the Page Tags for extra lulz)

http://gameinformer.com/b/news/archive/2010/10/07/game-boat-the-most-useless-peripheral-in-history.aspx

So what's yours? It can be any accessory, peripheral, or stupid device.

 

[JustCallMeAlex]

The e-reader for the GBA (not compatible with the SP)

http://en.wikipedia.org/wiki/Nintendo_e-Reader

Ya the thing read these cards that you slid through it. The different cards played different games. I actually won mine along with 50 Animal Crossing back packs like 9 years ago. It never did much and Nintendo dropped as quickly as they could.

I actually still play Donkey Kong JR on mine.

 

[MetalDooley]

The Roll'N Rocker for the NES.It was basically a plastic board on top of a ball.You were supposed to stand on it and control the game by tilting.Apparently it was useless as a controller as well as being very hard to actually balance on

Spoiler

 

[Theo Rob]

U-FORCE for NES
i just doesnt work

 

[Remissus]

The e-reader for the GBA (not compatible with the SP)

http://en.wikipedia.org/wiki/Nintendo_e-Reader

Ya the thing read these cards that you slid through it. The different cards played different games. I actually won mine along with 50 Animal Crossing back packs like 9 years ago. It never did much and Nintendo dropped as quickly as they could.

I actually still play Donkey Kong JR on mine.

Oh yeah, I remember that thing. Still have mine and a rather large volume of cards for it stashed away in the attic. An interesting but silly device. Only use I had for it was the Mario Party board game type thing I had for it.

 

[Uber Evil]

The e-reader for the GBA (not compatible with the SP)

http://en.wikipedia.org/wiki/Nintendo_e-Reader

Ya the thing read these cards that you slid through it. The different cards played different games. I actually won mine along with 50 Animal Crossing back packs like 9 years ago. It never did much and Nintendo dropped as quickly as they could.

I actually still play Donkey Kong JR on mine.

That says that it is compatible, just not flush.