Some people have a hair across it, and should be told so! (politely of course...)
Raise one brow like Spock, and a calm monotone voice... "I'm sorry, but you are out of your mind"
I had a simular thing happen with a panel once, the Inspector made some wild claim about "modification" of a neutral buss. So we continued with the Inspection, while I sent a guy to the supply house to get another one. He came back, we opened the un-opened box in front of him. Then took it back, a waste of time and money......
