I took a physics test a couple days ago. That night I was tormented by a vision of me using πr^2 instead of 2πr for the circumference of a circle. I woke up in a cold sweat gasping for air, hoping that it was all just a horrible dream, but after verifying with my physics teacher I did indeed use the wrong formula. He said he'd only take one point off instead of two, but still unfortunate.
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