What is it about USB devices that makes people want to abuse them so? This HDMC USB key can be dunked 1 meter under water and withstand shocks from drops of up to 4 feet, according to Akihabara News. Other than its rather odd almost-square shape (about 2 by 2.4 inches), the key is most notable for an extra-wide cord that doubles as a protective bumper around the device.
If you're really sadistic, however, you probably also want to consider the Kingston key that can be submerged even deeper (4 feet) and withstand temperatures minus-4 and 185 degrees Fahrenheit. But then you might get reported to the USB-safety authorities.