Oh, Grandpa, I messed up again.
4 seconds sound clip from Darkwing Duck - Darkly Dawns the Duck: Part 2 (S01E01).
You can hear this line at 00:11:53.864 in the DVD version of the TV Series.
Quote context
[...]
- Well, at least they have you, too, fat boy.
- I'd love to stay, but I have a date on a bridge with a little girl!
- No, don't. He's getting away! Gosalyn!!!
- Why can't this nutcase live on the ground like normal people?
- Oh, Grandpa, I messed up again.
- I sure don't mean to make trouble.
- This time you're coming with us.
- Get her!
[...]