^ That's how I'd do it if I were to do such an evil trick. With the many shapes and sizes of USB drives, I can imagine it would be easy to pass it off as a fashionable or highly advanced/capacious drive. "Don't mind the whine/high pitched noise; that means it's working REALLY fast!" :bigsmile:
There's probably an unlimited number of other methods, but that seems like the most straightforward (with my limited knowledge of electricity).