As a general rule, Hollywood studios tend to avoid the dreaded R rating with their big tentpole movies, because it restricts which audiences can see it. If a movie is rated PG-13, 13-year-olds and their elders can enjoy it. But if it’s rated R, every ticket-holding viewer needs to be over 17 years old (or accompanied by a very cool parent or guardian), so the studios miss out on a large chunk of the moviegoing population, especially during the lucrative summer box office window. But that doesn’t mean R-rated movies can’t bust blocks. Some of the highest-grossing movies ever made have been rated R.