It's a mug with a hole in it which renders it completely useless to mug thieves. Just keep the plug safely stowed away from harm (on your key ring or in a vault) and you will find that no one is interested in stealing your mug anymore!

Tired of mug-envy: your co-workers using your mug after you've washed it out and you have to wash another just to get a cup of coffee? Unplug it and go! (via Gadget Shop)

How Cool!