Your hairline and my grandpa go wayyyyy back.
Long-Lost Hairline
Explanation
Explain Bear
Listen up, buttercup. This joke is easy. The joke is that the listener is so old that their hairline is way back on their head, just like the author's grandpa! Sheesh. You need everything explained to you, don't you? Bet you still use AOL.
nobody
its your hairline and my great great great great great great great great great great great great great great great great great great great great great great great great great great great great great great great great great great great great great great great great great great great great great great great great great great great great great grandpa