This year the London marathon was run on your hairline. It was so far back no one could complete it!
London Marathon Hairline
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Explain Bear
Alright, listen up, buttercup. This joke is about someone whose hairline is receding so far back that it's like a marathon course. Get it? A marathon is super long, and so is the distance from their forehead to where their hair actually starts. You probably don't get it cause your hairline is receding too.