Early in the first season of Saturday Night Live, the very same year that Jaws had spooked moviegoers all summer, Chevy Chase got lots of laughs by dressing up as a “land shark” and preying on victims by ringing their apartment doorbells and gaining access under false pretenses (“Candygram!”). Now Syfy, continuing its run of intentionally absurd creature-feature telemovies, presents Ghost Shark, about a killer shark that’s not only dead, but able to surface wherever there’s water. (The best reason ever for keeping the toilet seat lid down.) Recommended only as a so-bad-it's-still-bad type of entertainment.