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A person who thinks they're the smartest person in the room but can't even spell 'ignorance' without help from a dictionary and a curse word.
'I don't need to study for this test. I already know everything.', then failed the test and cried in the hallway.
'He said he was a genius. I asked him what a genius was. He said 'a genius is someone who thinks they're smart.'
Tried to explain gravity to a jackclown. He said it was 'just a theory' and walked out.