Future Hairline

When I was in middle school, I was on my bus and people were doin' hairline jokes, and I heard this guy say, "Your hairline goes back to... uhhhhhh... 2042?"

Explanation

Experiment

Explain Bear

Alright listen up, chucklehead. This joke is funny because the dude is saying the other dude's hairline is so far back it's like looking into the FUTURE. Like, 2042 far. And you, my friend, probably think 2042 is next year. But I do have to admit that you did try, as the author of this joke, so I guess your parents did raise you right.