From Cinderella, after she asked to try on the glass slipper. Her stepfamily starts laughing at her, and the Prince demands to know what's so funny.
Stepmother: Why it's just Cinderella. She's nothing but a nothing!
The Prince: Madame it takes one, as they say, to know one.
The end battle in Sleeping Beauty, between Christopher Reeve as the Prince and a giant One-Winged Angel version of the evil fairy. It's Superman vs. a fifty foot Maleficent, how can that not be awesome?