He's too busy, Mom.
3 seconds sound clip from the The Sandlot (1993) movie soundboard.
You can hear this line at 00:10:34 in the Blu-ray version of the movie.
Quote context
[...]
- Honey, I want you to make some friends this summer. Lots of them.
- But I'm not good at anything, Mom. Face it, I'm just an egghead.
- Honey, you'll always be just an egghead with an attitude like that.
- Oh, no, honey, he's not. He has some time. You go on back out there and ask him.
- Uh, Bill, uh... I mean, Dad, uh, can we... I mean, could you, like you said, teach me to play catch?
- Yeah. Sure. But I gotta get this done, okay?
- Bill? Uh, couldn't you take a break and teach him now?
[...]