Thrillers are a profitable genre, with Titanic being the second highest grossing film of all time at over $2 billion. While Avatar is the highest grossing film overall, Titanic and Avatar were both directed by James Cameron. Most successful thrillers are rated PG-13 to appeal to a wide audience, though some R-rated thrillers like Se7en and Red Dragon were also very successful. Thrillers make an average of $27.6 million per film, higher than the $25.6 million average for comedies, even though there are fewer thriller films. The Walt Disney studio has distributed some of the most profitable films, including The Sixth Sense and Signs.