Scarlett is a what many would call a "spirited" child full of piss and vinegar. She makes an art of having a fit and has truly perfected it.
You never know what will set her off or more like what wont set her off. There is no avoiding it, she is like Old Faithful, she cant help but erupt at regular intervals.
I have developed many coping mechanisms to deal with this. My old standby is just telling saying goodnight and heading to bed to let Kevin deal with it. Sometimes I hide in the backyard. Tonight I hid in the corner of the dark kitchen and it worked!
Oh Shit here she comes I gotta run and hide!