Never. It's just about knowing how much time you've got between hearing footsteps/door opening and getting...incriminating sights.. closed or hidden.
If it be video material, headphones are for when others are sleeping- they can't hear you but you can't hear them.
Sexy MSN chat/webcam would be less embarrassing to be caught at, but it does require a 'brb' typed before closing/hiding.
Dolphins Spiders have reserved seats in hell.
I've brought 2000 BBs for them. That wasn't enough.
But seriously, using BBs isn't a great idea as the chance of them bouncing into something valuable is too high. I'd only reserve that treatment for the really huge ones- or 'big George' spiders as we call them in our family.
Though normally the best answer is to cower on the chair like a pussy untill my brother/flatmate/whoever is mad enough to get close to those daemons is available.
Oh sorry, was this thread about masturbating?