Once in a desktop support position I had a ticket for a broken keyboard. Ticket listed out some troubleshooting done, so I came with a replacement keyboard in hand.
I did a quick check and confirmed the keyboard had an electrical issue and wasn’t working. Replaced it and took the old one back to our trash box.
I get a call a few minutes later from the user saying thanks for the replacement. I asked what happened to cause it, and the casually told me that he got a really bad bloody nose, leaked all over the keyboard, and even though he wiped it up the keyboard still wasn’t working.
So, I handled a keyboard that was shorted out due to excess blood in it. You don’t normally expect to need training in handling human fluids in a standard IT position.