do you have a sense of superstition

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well, for quite a long time, i have felt that my life is being out of my control. take exams as an example, since i was a senior high school student, i found every time, when i got a lucky examing number, i mean containing 8, my score would be remarkable. however, if not 8 but 4, no matter how well i had prepared, the result would be disppointing. although my friends told me it was just my mental suggestion had made these differences, i can really feel there is something extraordinary.have you ever had similar feelings?