If she's like this at age five, I fear for the teenage years....
Thing One (Age 7) : [to Thing One] 'Hahahha you've let one off!!!'
Thing Two (Age 5): [Mightily pissed off] 'No I haven't. Shut up!'
The Husband: 'Thing Two....'
Thing Two: 'Shut it, i don't want to hear it!'
Thing Two: [to me] '& you can shut it too!'
Thing Two: [slams bedroom door] 'I don't want to hear any of you!'
Thing One: [sets off Thing Two's guitar that's in his room]
Thing Two: [storms out of her room glowring, in the buff, snatches said guitar and storms back into her room, slamming her door behind her]