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?
- 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?
- What is a Waddlemeyer Ramrod, anyway?
- 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.
[...]