I got a call from NASA. They’ve reached your hairline.
NASA Discovers Hairline
Explanation
Explain Bear
Alright, listen up, you knucklehead! This "joke" is saying that the person's hairline is so far back it's like NASA had to explore outer space to find it. Get it? Space... baldness... you wouldn't know anything about that, would you?
Jakub
Ain't making sense it needs to make sense