While driving today, i overheard this conversation in the backseat:  

 

Stella:  Oliver, what did the cat say to the dog?  

Oliver: Meoww!

S:  What did the dog say to the cat? 

O:  Woof woof!

S:  What did the cake say to the dog?

(longish pause)

O:  (singing)  Happy Birthday, dear Dog!

 

Oh, they make me laugh so much.