This is a small exchange in the movie Peter Pan.
Wendy : Once upon a time there was a boy named Peter Pan, who decided not to grow up.
Hook : Skip the prologue
Wendy : So he flew away to Neverland where the pirates are.
Hook : What fun he must have had.
Wendy : Yes but he was rather lonely.
Hook : Lonely? He needed a Wendy. Why a Wendy?
Wendy : He liked my stories.
Hook : What stories?
Wendy : Cinderella, Snow White, Sleeping Beauty.
Hook : Love stories?
Wendy : Adventures! In which good triumphs over evil!
Hook : They all end in a kiss. He does feel! He feels about you. She told him stories. He taught her to fly. How?
Wendy : You just think happy thoughts. They lift you into the air.
Hook : Alas, I have no happy thoughts.
Wendy : That brings you down!
Hook : How else?
Michael: Fairy dust! You need fairy dust!
Hook : What of Pan? Would unhappy thoughts bring him down?
Wendy : He has no unhappy thoughts.
Source: http://www.imdb.com/