Well, Bulba stole your grandfather's invention, and he... he thinks you know the code that operates it.

6 seconds sound clip from Darkwing Duck - Darkly Dawns the Duck: Part 2 (S01E01).

You can hear this line at 00:03:50.589 in the DVD version of the TV Series.

Quote context

[...]

- You mean you don't take off your mask for anyone?

- That's right. Not no one, not never.

- What about a really, really, really close friend?

- Well, uh, maybe... someday.

- Hey, it's a start.

- But if I use your bed, where will you be sleeping?

- No, I won't be. I'm a night person, remember?

- And with Taurus Bulba at large again, I'll have to be extra vigilant.

- What does he want with me anyway?

- Well, Bulba stole your grandfather's invention, and he... he thinks you know the code that operates it.

- What is a Waddlemeyer Ramrod, anyway?

- It's a trachyon-specific device that disrupts gravitational bonds on a molecular level that allows manipulation on a macro scale.

- What does that mean?

- I don't know.

- I think it makes things flow and stuff.

- Here's a picture. That's Grandpa.

- Well, it looks like you were really close.

- We were.

[...]