USB Squirming Tentacle: 2011 - ThinkGeek
This was a weird project to try and capture the success of the 'humping-dog' USB device in a different form factor. At first I wasn't really sure the mechanism could be made small and robustly enough to work, but we have some amazing engineering partners! All it does is wiggle slightly when it's plugged into your computer.

USB Squirming Tentacle $14.99