In this particular example, students were acting out idioms as part of a unit on figurative language. We used the pictures to make a book of idioms and as part of a writing activity. The pictures help the children remember the prewriting activity, even if it's several days later. If your VCR is connected to your computer, you can even make stills from video. Digital stills are nice for capturing moments.
Children can assemble stills with captions on a page for reinforcement and culmination.