- That's because you flunked the intelligence test, right?
- Yeah, I flunked it.

4 seconds sound clip from the The Greatest (1977) movie soundboard.

You can hear this line at 00:51:31.530 in the Blu-ray version of the movie.

Quote context

[...]

- You don't know it, gentlemen, but almost every black fighter in the history of boxing ended up broke. That is not going to happen to Muhammad Ali.

- Maybe you don't know the reputation I got, Mr. Muhammad. As a prophet. So many times I said something terrible is going to happen to a particular fellow. And what do you think happens? He comes to grief.

- That's very interesting, Mr. Curtis.

- Because I'm a bit of a psychic myself. And I'm predicting that if any grief comes to anyone I know, there's going to be twice as much of the same to whoever caused it.

- Muhammad, do you know you've been reclassified in the draft?

- No, sir. All I know is last they had me pretty dumb. I was classified 1-Y.

- That's because you flunked the intelligence test, right?

- Yeah, I flunked it.

- I told you all I was the greatest. Never told you I was the smartest.

- Now they've got you reclassified 1-A, which means you can be inducted at any time.

- Ain't that something? That shows you how wise they are. To reclassify me, switch me to 1-A without giving me a test.

- Or maybe they got some heavy mail about why you're not over there doing your job.

- How would you feel about that, Muhammad, being sent to Vietnam?

- Don't feel nothing. I'm not excited at all.

[...]