Oi, I've got the polystyrene one. Not a fear as such, but the noise goes through me. I just have to leave the room when someone has some. It makes unpacking a new widescreen TV a real battle of wits.
Petrified of Spiders though. I have an anti-spidery device which lowers the number (well, the amount of time they spend in the house), and a Dyson has been a welcome addition to the household. The main problem is I know they are in my shed. Where the lawn mower is. So I have an extra-ordinarily long lawn at the moment.