I was almost finished with a very long script involving a cron and scheduling a few website tasks when my mouse died... the battery that is. It takes one AA size. This was at my office. I saved the unfinished work and started my search...
I usually keep a supply, so looked in the top desk drawer, moving everything around, checking other drawers, no battery. I sometimes keep batteries in the refrigerator, so looked there but nope, no AAs.
I went down the hall to my colleague's office, no answer. I then called down to the lobby and asked for maintenance which resulted in a voice menu with no related choices.
Then it dawned on me; I had at least one AA battery in one of my devices at my home across the street a ways. I left the building, walked several blocks home and started removing AA batteries from remote controls units.
Returned to the office about an hour later & got back to work... voila!
So... what have I learned from this? Not much except I HATE BATTERIES!