- What did I do?
- Plenty, mister, plenty.

5 seconds sound clip from the WarGames (1983) movie soundboard.

You can hear this line at 00:46:37 in the Blu-ray version of the movie.

Quote context

[...]

- Where?

- Seattle, Washington.

- Shut it down.

- Somebody's playing a game with us.

- Hi, Dad!

- David! David, come in here.

- What did I do?

- Plenty, mister, plenty.

- You have just passed all of your classes this semester. Congratulations, dear! Show this to your dad.

- Honey, David has something to show you.

- What's that?

- Here, Dad.

[...]