[If he'd understood movies themselves, he might have understood her easy mood changes a little better. But in this case, it might be fun.]

Hmm... how to explain it... it's like watching a story take place. Like a performance, but the images were captured... There are a lot of different kinds of movies. Some are sad, but others can be really happy or really sweet. I'm sure we can find one we'd both like.

[So please go see a movie with her!]