Clearly you're not ready. And you're not coming back until you are.
4 seconds sound clip from the Finding Nemo movie soundboard.
You can hear this line at 00:13:31 in the Blu-ray version of the movie.
Quote context
[...]
- You know you can't swim well.
- No. It's not okay. You shouldn't be anywhere near here.
- Okay, I was right. You know what? You'll start school in a year or two.
- No, dad. Just because you're scared of the ocean...
- Clearly you're not ready. And you're not coming back until you are.
- You think you can do these things, but you just can't, Nemo!
- There's... Nothing to see. Gather, uh, over there.
- Excuse me? Is there anything I can do? I am a scientist, sir. Is there any problem?
- You know, I'm sorry. I didn't mean to interrupt things.
[...]