What's the Weirdest Computer Mouse You've Ever Seen?

Touchpads suck. They are obviously and infinitely inferior to the glory of the mouse. But that doesn't mean there's not any room for innovation in mouse-world. Plenty of folks have tried to improve on perfection with ergonomic-y joystick-like tricks and other strange tweaks. What's the weirdest one you've ever come across?

Some of them turn the idea of a hand-controlled pointing device upside down, others just look really really strange. We're looking for both. Above is something called the Rockstick 2, and it's a pretty good example.

For easy readability please follow this format for entries:

[Picture of the mouse]

[Any notes about how freaking weird it is and how that makes you feel inside]

[Link with more info, if available]

Let's get freaky.