The Blob (1958)
Mexican Lobby Card
One of the most frightening monsters in horror cinema. And there's Steve McQueen tossed in for good measure (he'd go on to do television's Wanted: Dead or Alive). The movie playing in the theater when the Blob spills out of the projector booth is Daughter of Horror (a re-cut of Dementia, 1955). If you haven't caught this movie, do so: it's held up and still delivers the goosebumps.