Yes, that's the gun. It wasn't a sketch. Spaceballs was a film that my youngest watched over and over again. It parodied Star Wars and Aliens. Starred Mel Brooks, John Candy, Rick Moranis and Bill Pullman. John Hurt appears in a scene in a bar, says "Not again" and the alien bursts out of his chest. It wears a straw hat and carries a cane and does a song and dance on top of the bar!!