Any amount of time that seems to be lost by an individual or group who are playing any of the Fable games.
Also known to occur with the Assassin's Creed games, and Gears of War.
Girl: hey I'm kinda hungry, pause the game and go make me something to eat
Guy: no wonder you're hungry, it's 3am
Girl: I thought it was 7. Curse the fable timeshift phenomenon!