[flashback:]
Ray: There's no way I can ever go out with her.
Robert: Yes, you can.
Ray: No. The whole time she'll know that all I'm thinking about is her breasts.
Robert: Well, don't think about them.
Ray: Don't think about them, yeah. Don't think about zebras. Go!
Robert: Wow!
Ray: Yeah, see? What are you thinking about?
Robert: A zebra with breasts.
Ray: That's it, that's why there's no way I can go out with her.