How do we know we're not people in a movie?' she asked. I looked at her not knowing how to reply. Mama, [...] how do we know that things are real?' Great. Now we have a junior existentialist in the house. Well, we don't know. We just have to hope that what we think is real is real.' But how do we know?' she asked, insistently. Ah, a scientist, who wants empirical evidence. We don't know. We just have to hope.' Mama, how do we know things aren't a dream? You know, how sometimes life feels like a dream? Do you ever feel that way?' Yes, sweetie, I feel that way all the time.