Neill Blomkamp’s R-rated robot film “Chappie” topped the box office with a lackluster $13.3 million debut, according to final figures Monday, while the Vince Vaughn comedy “Unfinished Business” proved all but dead on arrival with just a $4.7 million opening.

This is the lowest showing ever for Blomkamp, who also directed “Elysium” and “District 9,” and the latest in a series of box office disasters for Vaughn, whose box office profitability has stalled in recent years with the release of flops like “The Watch” and “The Dilemma.”

For a low-earning weekend that has helped to clip the box office’s year-to-date advantage over last year, “The Second Best Exotic Marigold Hotel” proved to be a silver lining. The PG-rated retiree comedy took in a respectable $8.5 million from only 1,573 locations.