Mycestro Wearable Mouse

It's been a long time since I wrote about strange computer mice on here. You wear this mouse on your index finger and you move the arrow by holding the side of it with your thumb.  According to the manufacturer's website the inventor (Nick Mastandrea) saw somebody struggling to use a normal computer mouse on an airplane and he came up with this idea. You can buy one here:

http://www.thinkgeek.com/product/ikrr/?pfm=electronics-gadgets_newest_ikrr_6#tabs