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A person who starts off quiet but turns into a loudmouth nightmare once you get to know them. They’re like a sleeping volcano, don’t wake it up.
She was calm at first, then she exploded when I said her pizza was bad.
He didn’t say a word until I made fun of his hair, and then he ranted for 20 minutes.
She sat in the corner, then when I asked her why she was there, she screamed at me.