A conversation with my parents, only slightly exaggerated:

Mom: I'm making Andres [Ed's note: otherwise known as The World's Most Adorable Nephew] a dragon costume for Halloween. Do you have any suggestions?
Dad: [warningly] Janie....
Me: It depends on what kind of dragon he is! Do you want him to be from the western tradition or the Asian tradition? I mean, he could be a wyvern or a river dragon, or ooh! like Fafnir!
[Stunned silence]
Me: Does he have little wings? He won't be a dragon unless he has wings...
Mom: [slightly desperately] No, he doesn't have wings.
Me: Well then he's not a dragon. He's a dinosaur.
Mom: OK, he's a dinosaur then.
Me: Well there I can't help you. I don't know anything about dinosaurs.
Mom: Oh. Um, too bad.
And dad laughs.