I've seen some of this, people never think about the inside and what can develop.

OMG O_O

Wow! Those are gross. My mom's comupter looked similar to some of those when I opened it up once, though not as bad. I take some canned air and a shop-vac to mine at least once a month.

A computer should be cleaned every few months :c

They should have bought Macs. They are so magical, that dirt doesn't even stick to them.

I think some of these are fakes. How would mice or a frog get inside? The vent holes are not large enough for them to get in and most computer cases are steel so the mice couldn't chew their way in.

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some ppl leave the side off for ventilation so i could see it