Things your cat shouldn't do but always does

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My cat always vomits when you least expect it. She always pigs out on her cat food. We can never leave her on her own in the living room. One day I come in from the kitchen and she puked on the window ledge that she was sitting on and down the wall. I've found that she makes this funny noise before she does it so it give me time to let her out. Any other naughty cats out there?