Odd things from Japan / Curiosidades de Japón: Mobile phones, truly mobile

"'Keitai-byuun' ('Keitai' =cell phone, 'byuun' =sound of a speedy run) is a set of wheels that you can attach to your cell phone to make it run like a little car. What for...? I guess it's just for fun, I don't see any other purpose here. This is for people who are really, reeeally bored and are willing to waste a few coins. It comes in 6 colors and 2 types: manual and pull back."