- What's that?
- It's getting ready to spout.

5 seconds sound clip from the Yogi's First Christmas (1980) movie soundboard.

You can hear this line at 00:54:03 in the Blu-ray version of the movie.

Quote context

[...]

- Oh, Yogi. That's not the surprise I meant.

- Well, don't feel blue. Until I'm through, this one will do.

- Ooh! I'll get him under the mistletoe somehow.

- So this is the famous geyser.

- It shoots water up in the sky, about 400 feet up.

- Why do they call it Old Faithful?

- Because it's one of nature's unpredictable wonders.

- Yeah, like Yogi.

- What's that?

- It's getting ready to spout.

- How do you like that? What a coinkydinky.

- Are we safe here?

- Nothing to worry about, lady, long as we're behind this fence.

- Well, there she blows.

- Oh! Astonishing. What power. What force. It's breathtaking.

- Indeed it is. Summer and winter tourists come from all over just to see this phenomenanom. Phenomenomenonana. This geyser, even.

[...]