Your hairline is so far back it became a case.
Far Back Jokes
Your hairline is so far back your mom can't cut it.
Your hairline is so far back dinosaurs are seeing it.
Your hairline's so far back even Rosa Parks refused to sit there.
Your hairline's so far back that Dora the Explorer can't explore it!
Your hairline is so far back that it goes all the way across the globe.