9. Due Date (2010) – $65 million
This is something different than everything Downey has ever done.
On Access Hollywood to promote the film, RDJ said that working on this film was his “most glorious experience” in his entire film career.
The story of high-strung future father Peter Highman (Robert Downey Jr.) is forced to pair a ride with aspiring actor Ethan Tremblay played by Zach Galifianakis, on a road trip in order to make it to his child’s birth on time.
Everything that happens after they hitch a ride is pure comedy. It is different to see Downey is a movie playing such a character.
Due Date gross a bit over $100 million and because of that is one of the most expensive RDJ movies.