About the same time the 500-mile email problem happened (mid 1990s), I had a difficult to understand issue with my office PC. Every morning, I'd come in, slide my hard drive sled in, and turn the computer on. We had 128 Kbps ISDN internet at the office and I had the same at home, but that was too slow to do much work. So I'd take the drive home so I could work at night, especially in the winter when the office was too cold at night.

Suddenly one winter morning, the PC wouldn't boot. I had to run to a meeting. When I got back, I turned the PC off and on again and everything was fine. The next morning, the same thing happened. The third day, I didn't have a meeting. I turned it off and back on, still no boot. I'd gotten in late, so I just turned it off and took an early lunch. When I got back, it still wouldn't boot. But I had a meeting, so I ran to that, leaving the computer on. When I got back, it booted fine.

The next morning, same thing. I decided to look inside, not having any idea what might cause such symptoms. As I took the shell off, a tiny mouse came out, jump off my desk, and ran across my lap before jumping on the floor and scurrying out of sight. From inside the computer came the smell of mouse urine. Apparently he'd been crawling in through the open drive bay to keep warm every night, and urinating while he was in there. Once the computer had been on for a while, the heat and airflow would dry it out enough to eliminate whatever electrical short was keeping it from booting. I went to the store and bought an empty drive sled to put in the drive bay whenever I took my drive out, and the problem never came back. I felt lucky that the liquid didn't cause permanent damage.