J: Mommy! N bonked my head!
N: No J! You bonked my head first, then I bonked your head!
J: Oh! Mommy! I bonked N's head! Then he bonked my head!
N: I'm sorry I bonked your head J!
J: That's okay! I'm sorry I bonked your head first!
(And I'm sorry about all the exclamation points! But that's the way they talk! It's very loud! Yet very enthusiastic! And polite!)