I love it when Fenton comes home in the Gizmoduck suit and his mom says, "Fenton, did you join a heavy metal band?" xDD Possibly my favorite joke in the whole series.

Launchpad in the Courage Cosmo (whatever) show, "I would've been back sooner, but they weren't done putting my brain through the blender."
Scrooge, in Send in the Clones, trying to explain to the reporter why Dewey and Louie are tying up Huey, "My nephews and I just love to play cowboys and Indians, dances around whooping"

"A Sea Monster ate my ice cream!" Scrooge shouts a number of times when he finds out a boat with his money(the cover story was it was ice cream) was sunk. This was on an episode during the story line of the contest between Scrooge and Flintheart on who had the most weight in money.

I remeber this one episode "Ducky Horror Show" After he realizes that the people staying at his mansion are REAL monsters he rushes home to save his family. He races up the stairs to the boys room "Huey, Dewey, Louie!" Sees the blob coming toward him "Yucky!" Makes me luagh every time.

Well, as if you couldn't expect it, my favorite quotes will come from Fenton, or have something to do with him.
I'll start with what must be funniest work advert ever: "Scrooge McDuck needs accountant. Count money, but don't count on getting any". I have no idea how Scrooge got any applicant other than Fenton with that ad!
Or when Fenton asks Ma Beagle: "May I borrow the proverbial cup of sugar?"
I also love the country-singing toaster timer, that Fenton had in his Gizmoduck suit: "It's nine o'clock! Your toast is burnt! Yipee-yi-yi! Yipee-Yipee-yi!"
And these are three great Fenton quotes from the episode "Allowance day":

• Right now, I wish it was Tuesday and this was Belgium! (It wasn't until a few months ago, that I found out about this being a movie reference, but I still always found it funny).
• But I'm too young to die! And too nice! And much, much too nervous!
• But I was just starting to enjoy my anguish!
  Intelligence and purity.

I don't remember the episode, they were in Australia, and Scrooge asked the boys how they could've lost Webby when he wasn't even gone 15 minutes and they say 'actually we lost her in less than 15 seconds!'

One of my favorite exchanges was from Where No Duck has Gone Before
After learning that the nephews and Doofus are fans of that cheesy Courage of the Cosmos show, he remarks "You like this nonsense?!'
Doofus then responds, "Aw, you sound just like Launchpad. He says Major Courage couldn't tell an asteroid from an"
The phone ringing proceeds to cut him off, but based on the dialogue it's all but guaranteed that last word probably would have been @$$-hole.
I still can't believe they managed to get away with that.

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