Imagine this scenario. You're working in an unnamed electronics store, and you get into a conversation with a potential customer. He asks you about Infared Thermometers, so you begin to demonstrate one you just happen to be holding. At this point he asks you if you sell EMF meters, and the alarm bells go off.
You've got yourself a ghost hunter! What would you do? I have absolutely no idea, and each time it happens I'm almost at a loss for words.