In related news: today I discovered one of my collegues had taped off his webcam, because he was "afraid someone might be spying on him", but only snorted when I pointed out that securing his system with a four letter word wasn't all that safe to begin with...

gotta side with your friend on this one. you could have a 200 character password and the nsa could still break in ezpz. heck they can even break into a computer thats turned off. here are some links just to touch the tip of the iceberg
However a piece of tape over the camera is simple and foolproof.