It's no use! Some big oaf's standing on the grate.
3 seconds sound clip from Darkwing Duck - Toys Czar Us (S1E32).
You can hear this line at 00:15:36.634 in the DVD version of the TV Series.
Quote context
[...]
- We're busting out of this joint. On three. One, two, three!
- Don't worry, we'll come back with help... if we can get a certain perfect parent to drop his mop.
- Pepperoni olives... Thin crust... It's pizza! This way, guys!
- It's no use! Some big oaf's standing on the grate.
- Now where could those kids have gone?
- That's no oaf. That's your dad.
- Dad? Dad! Hey, Dad! Down here, Dad!
- Gosalyn Mallard! You come out of there right now, young lady.
[...]