All the dust bunnies that form in the cracks of my case mix with the dirt on the fans to form life that develops into a small civilization that at first worships me, but soon turns against me. I'm scared that they'll break all the voltage control on my mobo, stop all the fans, and tamper with the BIOS chip so that my computer bursts into flames while I'm out, burning my whole house down.
So I check. Everyday. To make sure I keep the bunnies and fan scum seperate.