What is a “Landshark?”

This is a reference to an old Saturday Night Live skit (first season, 1975-76, according to my college roommate Michael Goldstein) loosely (!) based on the Jaws series of films. In this skit the shark (played by Chevy Chase, as M.G. reminds me) has become highly intelligent, can move on land, and knocks on people's apartment doors assuming a variety of identities (“Candygram,” “Flowers,” etc.), while the Jaws music plays in the background...