Slither (1973)

James Caan gives a remarkably understated performance considering his usual scene-stealing antics in movies around this time but is just right here as the cautious, conflict-hating car thief who is convinced he's caught up in something dangerous and stupid, but is still lured on by the possible reward. Peter Boyle is great as always as the reformed embezzler turned convention host, and it's nice to see a young and attractive Louise Lasser as his clueless but charming wife. Speaking of attractive, Sally Kellerman has rarely looked hotter in a movie even though her character here is completely nuts, and she has some of the best lines in this film.