Sherlock Holmes: A Game of Shadows is starring Robert Downey Jr.Robert Downey Jr. starred in Air America (Comedy)Air America (Comedy) is starring Robert Downey Jr.
[Human]: Can you recommend movies similar to Sherlock Holmes: A Game of Shadows? [Assistant]: Sure. Didn't that movie star Robert Downey Jr.? If you like his movies, you might try The Avengers or One Night Stand. [Human]: I love Robert Downey Jr. Did he star in any comedy? 
He sure did. One that comes to mind is Funny People. Have you seen it?