The Duplicate Items Scam is an overly used scam, but is still being used to this very day. This is how it works: The scammer tells the player that dropping an item and hitting Alt+F4 will double that item. The person being scammed drops their most valuble item and hits Alt+F4, which is the Windows shortcut to close a program, therefore logging the person being scammed out. The scammer then picks up that item and will most likely sell it.