The Whac-A-Mole game from Episode 40, the Dream Card episode. Sakura was struggling to hit all the moles coming from all around her, so Meiling decided to grab a hammer and help her out. With each other's backs covered, they had the time of their lives smashing up moles. Especially awesome is that Meiling used to hate Sakura with a passion and constantly distrust her when they first met, but at that moment, they were playing together like they've been best friends forever.
Against the Twin Card, Syaoran and Meiling's perfectly synchronized attack was the greatest display of Badass Normal in the whole series.
The second greatest being Meiling vs the Fight Card.
Meiling during the episode when Sakura is forced to transform The Freeze; not only does Meiling manage to stop a good deal of the large stone/metal penguins with just her bare hands to protect both herself and Sakura, but it's her idea to use The Freeze in the first place. Later, her very selfless and very immediate I Want My Beloved to Be Happy moment, a huge leap from the Clingy Jealous Girl that hated Sakura that she once was.
Also, how Sakura caught The Jump. Specially because at some point the girl (who mind you, was still a Na´ve Newcomer and basically realising how the deal worked) summons The Fly while taking a huge fall and being upside down. A little mistake and she would've died, but she managed to get this perfectly done.
With the risk of applauding assault against a minor, The entire Final Judgment. Poor animation aside it was one of the most brutally actioned scenes in the anime.
A meta example: NISAmerica managed to rescue it. They're giving it the full blu-ray remastered treatment. Best of all, they're using the Animax dub, which, according to Madman Entertainment, is supposedly EXTREMELY taxing and hard to get (even though it's in mono only). That takes massive balls and guts to do. They must really love this show if they managed to give it this much royal treatment.