11.   Our steady chomping of popcorn slowed, our mouths fell open and our eyes grew bigger.

12.   Their mouths fall open.

13.   Their mouths fell open and their eyes popped wide.

14.   Then their mouths fell open.

15.   When I walked into the kitchen and saw him flipping through the magazine and staring at the pages so intently, my mouth fell open.

16.   You saw them and your mouth just fell open.

17.   His face dropped and his mouth fell open.

18.   His mouth fell open.