Plugging in that USB stick you found lying around on the street, could lead to a security breach.
"…we dropped nearly 300 USB sticks on the University of Illinois Urbana-Champaign campus and measured who plugged in the drives. And Oh boy how effective that was! Of the drives we dropped, 98% were picked up and for 45% of the drives, someone not only plugged in the drive but also clicked on files."
It seems folks just can’t resist picking up a USB stick that they see lying around. It only took six minutes for the first device that he “lost” to be picked up.