Grandpa used to sing me a lullaby.
2 seconds sound clip from Darkwing Duck - Darkly Dawns the Duck: Part 2 (S01E01).
You can hear this line at 00:04:59.900 in the DVD version of the TV Series.
Quote context
[...]
- Hmm. Unfortunately, Taurus Bulba doesn't know that, and his men will be searching for you, you know.
- Although, if they knew how much spirit you have, they'd probably run the other way.
- Spirit? Mwah! Thanks, Darkwing.
- Ah, you just need something to relax ya. I think I have a large mallet around here somewhere.
- Grandpa used to sing me a lullaby.
- Oh, well, that's... I don't really do lullabies.
- Why don't you teach me one of his so I can sing it back to you?
- This has the suspicious ring of reverse psychology to it. But have it your way.
[...]