Well, since there is nothing you can do that I cannot do, it's a deal.
4 seconds sound clip from Darkwing Duck - Dead Duck (S1E47).
You can hear this line at 00:17:18.453 in the DVD version of the TV Series.
Quote context
[...]
- I have, over the millennia, acquired an expertise in many fields.
- Well, I bet I can do something you can't do.
- I find that highly unlikely.
- I had hoped we were beyond this.
- If I can do something you can't, you give me one more hour to go save Gosalyn.
- Well, since there is nothing you can do that I cannot do, it's a deal.
- OK, let's see you do this...
- Why, I'm sure it's very simple. I just, um... Hmm...
- Oh, I hate when that happens. It's so embarrassing.
- Well, looks like I win. See you around, sucker!
- Oh! Guess you just can't keep a good duck down.
[...]