Wow. There are so many. I can't choose just one.
The baseball scene, of course. Wow, that was spectacular! And ohmygod, Jasper?! Throughout the movie I didn't really think much of him, but this scene turned it all around! When he was doing all those bat moves I was practically drooling - how sexy did he look? And of course I love that bit where Bella calls Rosalie out. Ha, the look on Rosalie's face! And Bella looked all smug. It was great. It was also amazing because they could all just let go and act natural. Carlisle seemed so happy in this scene. My eyes were glued, I tell you.
Also, the end ballet scene. That was so cool. It sounds weird but I love the bit where Alice breaks James's neck. It makes me sound sort of freakish, but it shows that her size doesn't stop her. I'm a big fan of Alice and I think they chose the perfect person to play her. And that look that Edward gives Bella when he comes to her rescue! Wow. He looks so intense, as he does with the van scene.
There are also little things, like when the Cullens first come into the cafeteria and when Emmett rocks up on the back of his jeep. And the first kiss scene ...
You know, I think it would be easier to talk about the scenes I don't
like. Oh, wait. There are none. Huh ...