Bad Influence (1990)

Wimpy young executive Michael is about to get pulverized by a jealous boyfriend in a bar when a handsome, mysterious stranger steps in—and then disappears. Later that night, Michael runs into a stranger on a pier, who wheedles his way into Michael's life and turns it upside down.

Directed by: Curtis Hanson

Starring: James Spader, Rob Lowe, Lisa Zane, Marcia Cross, Rosalyn Landor, Kathleen Wilhoite

Links: IMDb, Movie posters, Movie stills