I did, and then I doomed it to destruction.
5 seconds sound clip from the Supergirl (1984) movie soundboard.
You can hear this line at 01:40:27 in the Blu-ray version of the movie.
Quote context
[...]
- Oh, terrific. The old dangling-in-a-cage routine.
- He's my math teacher, I think.
- But you can't just give up. You founded a whole city.
- I did, and then I doomed it to destruction.
- That was an error. A tragic one.
- Strong words. There are worse things than dying and I deserve every one.
- A horse... I think. On earth I think it's called a horse.
[...]