Good Luck Charlie/Funny

Several, as the show is actually pretty funny despite the reputation most DCOS have acquired for themselves.
This little gem:

Mr. Piper: "You're crazier than your wife!"
Bob: "Hey! No one is crazier than my wife!"
Amy: "Yeah, no one's crazier than me!"

In "Baby Comes Back", after the kids meet Captain Stretchy:

Gabe: Hey look, Captain Stretchy dropped his driver's license! *beat* Psh, "175 pounds" my butt. *flings license out car window*

Teddy's lines in her heartbroken depression were hilarious.

Why won't the world just go away?

In one episode, when Teddy is teaching Charlie opposites:

Teddy: What's the opposite of good?
Charlie: Gabe.

In "Hawaiian Vacation Part 2":
- During the ceremony for getting the family un-cursed, Manno makes Teddy, PJ and Bob run around Amy and say "Big and gross, big and gross, she's the one that's cursed the most" while Amy does the robot:

Hotel Manager: The sheet for the time share got ripped up, so we'll need your wife to sign again.
Bob: It's working, keep going!
Bob, Teddy and PJ: Big and gross, big and gross...

Bob: So you're saying that this is all because of a curse?
Amy: Yes. All of it. Me getting stuck in that elevator, the boys almost crashing in that helicopter, Teddy getting knocked out, you buying that shirt.

Bob: You don't like this shirt? I lost the receipt. I can't take it back.

Amy: THE CURSE!

- PJ's list of things that scare him: "clowns, heights, falling, spiders, unicorns, trolls, ogres".
In the episode where the Duncans go on vacation to a ski resort in the mountains:

Gabe: Did you know that you have to pay for room service?
PJ: Yeah, everyone knows that. Did you know that I'm a terrible skier?

Gabe: Yeah, everyone knows that.

PJ: We should have talked earlier.

"Why are you insulting me into a fork?"
When Mr. Piper was assigning roles to the class for a mock trial:

Mr. Piper: Walter, you can be the judge.
Walter: I can already taste the power...
Mr. Piper: ...That might be a mistake...

- Speaking of the case, Walter allows unrelevant things to go on in the courtroom, with the justification that he wasn't invited to the party either.
"Meet The Parents": P.J. is about to ask Skyler on a date and she loses her earring. He finds it and, on one knee, begins to ask her a question. Bob comes in and absolutely freaks out.
In the Crossover episode Charlie Shakes it up after the real Duncan siblings show up Deuce says to leave everything to him, prompting Teddy to wonder whether she should be relieved or worried

Rocky and CeCe: (In unison) Yes

- Also from that episode, in the Credits Gag, when CeCe, Rocky, and Flynn pop out of Teddys luggage, we get this:

Teddy: Okay, if that Deuce kid comes out of my purse, I'm gonna scream.
Deuce: (from inside Teddy's bag) Okay, then I'll just stay in here. (Beat) Ooh, mints.

Amy telling Teddy about Bob's bug conventions:

Amy: It's just a bunch of guys sitting around talking about poisonous gas ((Beat)) and then it gets boring.

Ms. Daphne having no idea what the internet is. Says a lot when PJ of all people knows more about it than someone else.