Also, self-proclaimed-experts-without-a-clue tend to bellow their simplistic answers and sound absolutely certain of every syllable.
People who really know anything tend to speak softly, hedge their answers with qualifications and reservations, and spend more time drawing out details from the questioner than they spend preaching The Gospel According to SPEWAC.
That can be a problem if you ask someone who is TOO EXPERT. Their answers can be too complex to understand or remember. "Go not to the Elves for advice, for they will say both Yes and No."
Unasked-for advice is usually as wrong as it was unwanted.
