Premise: Ruthless People is a 1986 American black comedy film written by Dale Launer, directed by David Zucker, Jim Abrahams, and Jerry Zucker, and starring Danny DeVito, Bette Midler, Judge Reinhold, Anita Morris, and Helen Slater, with Bill Pullman in a supporting role in his film debut.
Hypothesis: Ruthless People was Danny DeVito's first starring role, three years before 1986.