When you just can't work out what they are.
Girl 1 - I love Sean Paul, he's so sexy. Black guys really do it for me.
Girl 2 - Don't be stupid, he's asian. That's why I'm so attracted to him.
Girl 3 - You two have lost it, obviously he's white, black, cuban and asian. That's why all three of us are doing the triple tuppence tickle.
Boy - Clearly he's a nonation, however please continue.