Fluttershy would actually probably either 1)Scream (2)say "Oh my..." And look at herself from behind her mane like in episode one. (3) Give you the stare!(intensified by her dragonhood) Pinkie is perfect.
the funny thing is, pinkie's line sounds TOO perfect. I mean if you were to cut out everything else that you have of what the character is like in your head, I can actually hear that being a line pinkie would say in the show. I'm trying to stress that it is as close to show-accurate as a line can get without being actually in the show.