Revealing mistakes: After David sees the sign someone has put up in his room, he throws the sign into a sea of onlookers in the hallway, then storms into his room, slams the door, and emerges a few seconds later with a note he has written - a note of such length that there is no way he could have written it in the few seconds that he spends in the room, even in the unlikely event that he had paper and pencil immediately handy.
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