Daniel: Oysters are mammals.
Me: No, they’re not.
Daniel: Are you sure?
Me: Yes.
Daniel: How do you know they’re not mammals?
Me: Well, they have none of the characteristics of mammals at all, they don’t give birth to live young…
Daniel: How do oysters have baby oysters?
Me: I don’t know really.
Pregnant pause. Please forgive the pun.