As an IT practitioner I see a lot of strange things: Computers that behave in bizarre ways… users that behave in bizarre ways. I've never seen the like of the following, reportedly an actual error message that appeared on the screen of a printer at someone else's shop:
On the status panel of an HP LaserJet 4200tn printer:
WARNING: DEMON POSSESSED
After many years of doing this kind of work I can say that the message in question is possibly the most accurate one I've seen… if one believes in demons, anyway! So now we know who to call for help –not HP repair– an exorcist!
PhotonStopper 
LOL! Fantastic! Does it come with pea soup?
Users behaving in bizarre ways is guaranteed job security for IT people!