Scene: carloading in front of the school
Me to the son: Where's your lunchbox?
The son, barely controlled frustration: I don't have it yet! I. JUST. GOT. BACK. FROM. PE!
Me, reasonably: Then why are you here? Go get your lunchbox.
The son stalks off.
The daughter, aggrieved: He's in such a bad mood. He's so cranky.
Me: He's thirteen. This is what he is now.
The daughter: I wish he'd grow up!
Go listen to some good music: "Changes" from the album Best of Bowie by David Bowie.