A lucky guy got inside the garage of the Mercedes-Benz Car Processing Center in Long Beach, California and made the most of this situation: he started filming the "goodies" parked there. Among the most important captures, it is worth mentioning a barely-disguised test prototype for the upcoming C-Klasse Coupe, as well as the new SLK and possibly a M- or GL-Klasse prototype, both hidden under car covers. Check out more by watching the video!