Gee, Quackerjack, why do you think that is?
4 seconds sound clip from Darkwing Duck - Life, the Negaverse and Everything (S1E35).
You can hear this line at 00:01:20.180 in the DVD version of the episode.
Quote context
[...]
- Here, Dad. I think you dropped this.
- We, superheroes, have unnaturally keen instincts on child rearing, don't you think?
- Yeah.
- Another day, another major crime. Well, see ya.
- Oh, come on, Negaduck, you never hang out with us after a caper.
- Gee, Quackerjack, why do you think that is?
- No, that couldn't possibly be it.
- The Liquidator guesses it must be something else.
- It's because you've got a secret hideout.
- There you go, Megavolt, that's using the old dry cells.
[...]