Working as the sole IT support in the 1980's at the local college I was packing up for the end of the day when the Librarian burst in to the office looking for 'IT'.
It turned out there was a bag in the library - and it was ticking. Turns out that part of my support role was also potential bomb disposal. Wish I'd asked for more money. Eager fool in my early 20's that I was, I did take a look; and yes it was a clock.