Not so unusual, I guess, but I opened up my PDP-8/L and found a large mouse nest complete with mother and three jellybean-sized babies nursing. She ran away dragging them from her nipples. Just as well, I wouldn't have had the heart to kill them anyway. I also had a home-built S-100 system when I lived in an apartment. There were occasional roaches. One day I noticed a roach or two running into and out of the computer case. I lifted the lid and saw literally HUNDREDS of them, heading in every direction including up my arm. I retreated and returned with a large can of insecticide... there was an amazing amount of turds, too. Talk about debugging a computer :) -Charles