Not IT, but a similar experience
I once had a holiday which was a bus tour of the old cities of Morocco. (recommended, BTW.)
One morning at breakfast, the American lady next to me - whom I hadn't previously spoken to - said that her camera wasn't working.
So I asked what was wrong, and she said it was just completely dead. It had been fine the previous day.
So I asked if I could have a look. Took out the batteries, cleaned all the terminals and connectors, and put it back together. It worked perfectly. She was utterly amazed and extremely grateful.
So we started chatting.
"What do you do?", I asked.
Said she, "I design satellites for Hughes".