It's a Mystery, Charlie Brown (1974 TV Movie)
Linus: Ashes to ashes, dust to dust. When there is a mystery, in Snoopy we trust.
Patricia "Peppermint Patty" Reichardt: [to "Detective" Snoopy, thinking he's playacting] Your money or your life, you dirty rat!
Patricia "Peppermint Patty" Reichardt: [seeing Snoopy and Woodstock run away to get Woodstock's nest] Hey, kid! Come back! We didn't finish the game! Come back, Snoooooop!
Linus: Ashes to ashes, and dust to dust. Snoopy will find it, and find it he must.
Snoopy: [holding up a broom straw] Aha!
Lucy: That's a broom straw. So what?