"Hydrokinetic Adjustable Wrench" is a real product (and awesome)
Essentially the adjustable part of the wrench is restricted in its movement by a fluid inside the handle, which has nowhere to go once you twist the little stopper. Ingenious, but I actually like having lots of wrenches around. Makes me feel like a real man. Even though the high-tech view there makes it look like a sex toy from Tron 2.
Get one from ThinkGeek for the tool-lover in your life.