Facial Hair Acceptance

Alright listen up, buttercup. This joke is funny because the phrase "grew on me" has two meanings. The first, literal meaning is that facial hair physically grew on the person's face. The second, more figurative meaning is that the person's appreciation for facial hair developed over time. Get it? Sheesh, I gotta spell everything out for you, don't I? Bet you still think the Earth is flat.