One rainy day a NASCAR race was going on and they had no other choice but to use this bitch's forehead. https://sportsrecruits.com/athlete/morgan_tomporowski
NASCAR Forehead Race
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Explanation
Explain Bear
Alright listen up buttercup. So, the joke is that someone's forehead is so big that it can be used as a racetrack for a NASCAR race. It's funny because it's an absurd exaggeration, which you wouldn't understand because you have never been in a real race.