Who needs passwords when you can have this laptop lock? If your room mate or some jerk in the office likes using your laptop without your permission, then set a trap for those naughty fingers with Tino Dobra's Laptop Finger Trap!
The Finger Trap is attached to a Kensington Lock when the laptop is unattended. A screen saver tells passers-by that the laptop is locked, just in case they can't figure out that putting fingers on the scrolling pad will spring the trap.
It is a concept design that merits production for it is a highly visual way of telling inquisitive people to buzz off. The designer is a student at Universitat Der Kunste, Berlin, Germany where several of them were dreaming up different notebook accessories.