Robert Downey Jr. Coaches Jimmy Fallon Through Dramatic Acting Scenes (Video)!

Robert Downey Jr. is all smiles as he makes an appearance on The Tonight Show Starring Jimmy Fallon on Thursday (May 5) in New York City.

The 51-year-old actor talked about being freaked out when he saw the amazing effects used to bring his younger self to life on screen in Captain America: Civil War, which is playing in theaters everywhere now!

PHOTOS: Check out the latest pics of Robert Downey Jr.

Robert also revealed some of his acting weaknesses before coaching Jimmy through some of the random emotions he has to fake via green screen as Iron Man.

10+ pictures inside of Robert Downey Jr. making an appearance on The Tonight Show…