"Mm, mm, MM!"
In many films and media, many characters can let out muffled cries and/or screams, usually behind someone's hand or a gag, or when bouncing around inside some monster's mouth. Also, a character can scream into a pillow. Usually, muffled cries and screams are serious, but some of them can be funny.
Muffled Cries and Screams are as follows:
Kayley (Quest for Camelot)
Nani (Lilo and Stitch)
Jane (Return to Never Land)
Marion Ravenwood (Raiders of the Lost Ark)
Angie (Shark Tale)
Lin Yuan Guo (The Mummy: Tomb of the Dragon Emperor)
Vorb (We're Back! A Dinosaur's Story)
Lara (Justin and the Knights of Valour)
Sour Bill (Wreck-It Ralph)
Tina (Supernatural: About a Boy)
Peter Quill/Star-Lord (Guardians of the Galaxy)