I keep hearing people getting confused between metaphors and simile, and it drives me mad. It's early high school English. Sort it out. (English as a second language speakers are forgiven though, but native speakers really should know better).
p.s. I do know the answer - but I'm not gonna post it. And neither should you. Let the poll results speak.
p.p.s. I'm so sick of "like a ____" lyrics, so lazy.