Sophos ENews report: HERE ...
That article immediately brought to mind something I recently saw a kid doing in a big computer store. A scrofulous lad he was, narrow eyed and furtive. He would insert a USB stick into one of the demo computers, type something I could not see from a distance, wait a bit, then move on to the next one. Stopped and moved away when I looked at the computer next to him. He resumed the activity when I moved to a different part of the store.
I wonder what he was up to, not my business, really, but I guess you should be careful if you ever buy a demo computer.