BellGoRiiing wrote:
You get this little one button gadget thing, you press it and the 3DS makes a noise...perfect for finding lost 3DSes. lol
(as stupid as that sounds, that would be awesome. xD)
3DS go riiing. 
Actually, that's a very creative idea! If it worked for parked cars in crowded parking lots, it would definately be a shoe-in for the 3DS!