A person should always choose a costume which is in direct contrast to her own personality.
7 seconds sound clip from the It's the Great Pumpkin, Charlie Brown (1966) movie soundboard.
You can hear this line at 00:08:14.370 in the Blu-ray version of the movie.
Quote context
[...]
- Hey! I got an invitation to a Halloween party!
- Is the invitation to Violet's party, Charlie Brown?
- Yes. It's the first time I've ever been invited to a party.
- Eek!
- A person should always choose a costume which is in direct contrast to her own personality.
- Is Linus taking me to the party?
- But maybe there is a Great Pumpkin.
- Every year Linus misses tricks or treats, and then the Halloween party.
[...]