Lost in Nightmares," the new DLC episode for Resident Evil 5. By going to the front door of the mansion and attempting to open it a few times (remember what happened the first time you tried that?), you'll eventually get a "?" message and the camera will shift to Resident Evil's classic, isolated point of view.
More than anything, the Easter egg is a nostalgic reminder of the olden days of survival horror, before Chris Redfield had to juice up just to get out of bed in the morning.