Movie Quote from Galaxy Quest

Brandon: I just wanted to tell you that I thought a lot about what you said.
Jason: It's okay, now listen...
Brandon: But I want you to know that I'm not a complete brain case, okay? I understand completely that it's just a TV show. I know there's no beryllium sphere...
Jason: Hold it.
Brandon: No digital conveyor, no ship...
Jason: Stop for a second, stop. It's all real.
Brandon: Oh my God, I knew it. I knew it! I knew it!