Ghosts are a new one. I've had people blame everything from dust fairies to radio waves from the neighbor's ham radio. What's the most creative excuse you've actually heard from a customer? I had one insist his keypad was possessed because it beeped randomly, but it was just a dying battery.
Hold up, gotta defend the customers here because tech does some seriously weird stuff out of nowhere. My cousin's doorbell once rang by itself for weeks and it turned out to be some interference from a baby monitor down the street. People aren't just making things up when they say radio waves or ghosts, they're trying to explain gaps in what we can easily figure out. Sometimes the simple fixes aren't obvious until you look past the usual answers. Maybe we should listen more when they come up with wild ideas.