Library of Doom
My first computer job in college was as the backup operator for the research library's computer system. When I applied for the job I was told they had fast turn over on the position because people got freaked out by the sounds at night in the library. Being young, and really needing the job, I told the head librarian that I didn't spook easily and would be there for at least a year. I was wrong. My shift started at 10pm until around 1-1:30 am depending on the backup, so I was alone, in a darkened library isolated in the computer room. Thing about libraries, the books are constantly settling, making lots of odd shifting, creaking and other strange noises. After a month I was getting paranoid and started walking the library lobby between tape changes, sure someone had gotten into the building. After about 3 months, I couldn't handle it anymore and quit to preserve my sanity. Knowledge is power, stacks and stacks of books are just evil.