"When I turn 5, you can't come to my birthday party!"He'll turn 5 next June. Good luck remembering that grudge for the next 11 months.
And later during the drive:
He: I was mad at you first!It continued from there. I don't know who won that one. I tuned them out like the good parent I am. I will survive.
She: No, I was mad at you first!
He: You're wrong! I was mad at you first!