I can't believe I was so stupid. I should've just let you do it.
5 seconds sound clip from the WarGames (1983) movie soundboard.
You can hear this line at 00:26:21 in the Blu-ray version of the movie.
Quote context
[...]
- Hi.
- Oh, hi.
- I've been thinking... that thing with my grade. Can you still change it?
- I can't believe I was so stupid. I should've just let you do it.
- I don't know, it might be kind of rough.
- Why?
- Why?
- They might have changed the password.
- Maybe they didn't. Can't we at least try?
- Please?
- OK.
- OK.
[...]