I am the terror that flaps in the night!
3 seconds sound clip from Darkwing Duck - Life, the Negaverse and Everything (S1E35).
You can hear this line at 00:05:17.676 in the DVD version of the TV Series.
Quote context
[...]
- Oh, drat, it looks like I shall have to fetch another cake.
- Hey, is that coconut burgers I smell?
- I am the terror that flaps in the night!
- I am the cholesterol that clogs your arteries!
- You led Darkwing Duck right to my secret hideout, you knobs!
- We're not knobs! And we'll prove it!
[...]