Re and I are doing our Lift-the-flap routine as we do every morning. He quizzes me by lifting each flap in one such book and asking me what it is.
Re: Mamma, dis dis.. (points to a sheep)
Me: Sheep sheep
Re (annoyed): No mamma, dis dis. Mamma, say!!!
Me: Sheep sheep, Re. It’s a sheep!
Re (now convinced his mother is a moron): Mamma!!!! Sayyyy! Cow cow!
And thus a sheep turns into a cow. Or a rhinoceros into a hippo. Or a hippo into a pig.