I find this SUPPERRRR depressing.
This was a movie called Pound,I think? Im not 100% sure, but it was directed by Robert Downey Sr.
Now this was his only line, his only part in the movie, and he was nervous, obviously. They did a few takes and Robert wasn’t getting it quite right apprantly, much to his fathers anger. So according to the biography The Fall and Rise of the Comeback Kid, his father took Jr around the back of the set and slapped him, very hard, several times in the face, yelling at him that he has to get this right.