Well, what don't I understand?

4 seconds sound clip from the Good Will Hunting movie soundboard.

You can hear this line at 01:15:12 in the Blu-ray version of the movie.

Quote context

[...]

- Have you talked to him at all about his future?

- No, we haven't gotten into that yet. We're still bangin' away at the past.

- Well, maybe you should. My phone's been ringing off the hook with job offers.

- What kind?

- Well, cutting edge mathematics, think tanks. The kind of place where a mind like Will's is given free rein.

- That's great that there are offers, but I don't really think he's ready for that.

- I'm not sure you understand, Sean.

- Well, what don't I understand?

- Just so you don't get sticky fingers, huh?

- Tim, can you help us? We're tryin' to settle a bet.

- You ever heard of Jonas Salk?

- Sure. Cured polio.

- Ever heard of Albert Einstein?

[...]