Copy-cat

Yesterday while Cam and I were eating dinner, I heard a police siren. I said pointing to the general direction of the siren, "Cam! Do you hear that?? It's a police car!" And not 1 minute later:
Cam: "Mommy!"
Me: "What??"
Cam: (pointing) "D'ya hear that?!"
He kept doing this over and over for 15 minutes.