The sci-fi movie “Chappie” opened with $13.3 million to lead the box office this weekend, but moviegoers collectively yawned over a field overloaded with R-rated films.

Writer-director Neill Blomkamp‘s robot saga knocked off Will Smith‘s caper comedy “Focus,” which was second with $9.7 million. The holdover spy spoof “Kingsman: The Secret Service” was fourth with $8.3 million.

Vince Vaughn comedy “Unfinished Business” bombed and barely made the top ten with $4.8 million in its debut, giving the actor five straight misfires.
All of those movies were rated “R,” and that was a big part of the problem as the weekend came in a whopping 40 percent under the comparable weekend last year. Six of the top 11 movies were R-rated and even the weekend’s biggest milestone achievement..




— “American Sniper” became the highest-grossing film released in 2014 with $337.2 million — came from a movie with the restrictive ratings.