Answer: D) They did something dumb.
Explanation for this question is being written.
Answer: B) Off your head.
Answer: D) Common sense.
Answer: D) Think smart and use your head.
Answer: A) A "dumb" person.
Answer: A) A
Answer: C) 2
Answer: C) Is a know-it-all.
Answer: A) Made a total fool of myself.
Answer: A) To prank/shenanigans.