Some of the first lines in the story, in both versions.
Hikaru's Friend: What's wrong, Hikaru?!
Hikaru: The binoculars ran out...
The girls' arrival in Cephiro. Umi opts to mix panic, outrage, and high volume to deal with the situation. Fuu, on the other hand, is ridiculous in her attempt to stay calm and rational as though this is a normal situation, insisting on good manners and suggesting that that they arrived by way of Mt Fuji erupting. It only gets worse when Clef arrives.
Presea's outrage, flawless logic, and gleeful anticipation for over-the-top punishments for Hikaru, Umi, and Fuu when they are accidentally caught in the trap she set for Mokona.
Hikaru: We just stepped through the doorway, and it fell right on top of us!
Presea: Well, yeah... [DRAMATIC POINT!] Who'd it catch? You! What's it mean? YOU'RE THE VANDALS!
Just about everytime the girls (or anyone else for that matter) goes chibi.
Presea has a very good one in the English dub when she's explaining to the girls how to select their initial weapons through their willpower.
Presea: Don't you know how to do anything?! Just close your eyes and think real hard!
In episode 7 the girls decide to try out a device that Ferio had given them several episodes prior that he claimed would make wishes come true (when in fact, as seen later in this episode, it's actually a communication device). Umi goes first, wishing that they would rescue princess Emeraude so that she (Umi) would go back to Tokyo and win an upcoming fencing tournament. She then hands it over to Hikaru...
Fuu and Windam in the opening of the episode "Hikaru and Friendships Torn Apart". Fuu discovers that she's being held captive aboard the Dome of Fahren. Upon hearing that her Rune-God is alive and well, she realizes that she hasn't once addressed him as "Sir" like she does with every other male and she politely asks Windam about it.
Fuu: I've been calling you Windam ever since the moment we meet at the Sky Shrine. Is that alright with you?
Windam: What does thou mean?
Fuu: Perhaps you would prefer that I call you 'Sir' Windam? But I suppose that would mean, (raises her arms as though she were holding a sword) when I raise my sword to summon you I, I should call out Sir Windam! Instead of the way I've been doing it until now right?
Windam: ...Call me Windam.
Fuu: If that's what you would prefer to be called then I would like you to call me Fuu. ...Alright?
In the episode "Hikaru and Lantis' Dangerous Journey", after Umi denies that she's pacing around in her worry for Hikaru, Clef tells her to look at where she's standing, resulting in Umi asking when she teleported to her current spot.
In the anime, the antics of two of Hikaru's brothers once they see how depressed Hikaru is after the supposed Tokyo Tower Trip. Not knowing what happened, they become hilariously overprotective of her...