In the first season of the television series Dexter, his sister Deb
is dating a man who turns out to be the Ice Truck Killer. He has a gigantic industrial freezer inside his apartment where he kills his victims, with the door in plain view in the kitchen, right at the front of the apartment. The door is unmistakably a freezer door, and even has a window. In episode 11, Deb shows up at the killer's house and he invites her inside. We can see through the front door that the freezer door is clearly visible.
How could she possibly have missed such an obvious clue?