I love the idea of cars that don't drive unless you have the security key in the vicinity of the car connecting and unlocking via Bluetooth. If this also floats your boat, you're in luck (and a bit crazy). You can now have the same satisfaction with your computer. By plugging in this USB lock, it will behave normally whilst you and the key you've discreetly hidden in your pocket is within range, but as soon as you nip to the loo, it locks the computer away from prying eyes.
The only possible pitfall I can see is when all gadgets use this trickery, therefore loading you down with innumerable keys you have to secrete about your person.
Product page: USB Wireless PC lock [Via Coolest Gadgets]
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couldn't someone just take out the usb plug when you went to the toilet? lol.