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A state of mind is when you're so stubborn you think you're right even when you're clearly wrong and your brain is melting.
My mom says I'm in a state of mind because I won't admit I lost the video game.
My brother is in a state of mind because he thinks he can beat me at chess even though I've won 10 times in a row.
My teacher says I'm in a state of mind because I won't stop talking during math class.