In classroom settings, I always sit in a particular spot since I can concentrate best in that location. When someone unexpectedly sits in my usual seat, I get agitated because I'll have to learn how to sit, listen, and take notes in a different position. This readjustment is enough to throw off my concentration for the entire lecture.
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“Oh - You're a very bad man!
Oh, no my dear. I'm a very good man. I'm just a very bad Wizard.”
― L. Frank Baum, The Wonderful Wizard of Oz