When you get that customer's customer who forgets what the email is about:

-customer's customer was complaining they couldn't see a thing on some website-

Me: "That reference number didn't work... can you give me another reference number or something that might help find the thing?"

Customer's Customer: "I'm sorry but you're going to be more specific, I can't help you without a reference number."

-It appears customer's customer thinks I'm asking them for help now... let's see if...-

Me: "Never mind, close ticket."

Customer's Customer: "Ok!"

-me closes ticket-

┐(´ー｀)┌