At my first-ever tech job back in 2000, I was given a little Celeron desktop computer to do my work: mostly writing some ColdFusion and cutting up images in Photoshop. For the most part, the machine worked fine, except whenever I scrolled down on a webpage in Netscape, the box's PC speaker would start screaming. I tried to ignore it, but I was in a small room with two other nerds and it was getting really annoying.

One day, my frustrated colleague decided it was time to investigate. As part of the process, he noticed that there was very little air coming out of the power supply fan port. "Must be a busted fan and that's causing an overheating alarm" he declared. We unplugged the box, popped it onto my desk, and opened it up. The internals were pristine. No dust, nothing. The computer was practically brand new after all.

We were just about to crack open the power supply (not recommended, but we were getting desperate) when my colleague noticed that something was wedged inside the fan... it was the biggest (dead, thankfully) cockroach I have ever seen, at least 10cm long. For context, this was in Vancouver, Canada. Those just don't exist there.

My colleague jammed his screwdriver in there to grind up the cockroach carcass, then plugged the box back in. After a shittone of dessicated cockroach guts spewed out the back, my little computer was operating normally.

As best we could guess, the monster crawled into the fan in Malaysia when as was assembled and somehow got pinned in there, died of starvation, and then stowed away to Canada.