A Molly
Sweet as pie, but if you make them angry, they'll flip out and scream at you in the middle of a math test.
She screamed at me in the middle of a math test. I failed. She got a perfect score.
I made her angry. She flipped out and screamed at me during lunch. I got detention.
She was sweet. I made her angry. She flipped out in front of my whole class.