Robert Downey Jr.'s first movie line was in the 1970 film Pound, directed by his father, Robert Downey Sr.

Downey Jr. was only five years old at the time. His line was, "Have any hair on your balls?" as he played a puppy in this unconventional film, where animals are portrayed by humans. https://video.twimg.com/amplify_video/1844105798391119872/vid/avc1/568x554/F3eMYG--bEK1Q8mn.mp4?tag=16