The mathematical flex that demands respect! Someone boldly claims "I know all the prime numbers" and when challenged with "What's the largest?", they respond with the prime factorization of their post number (3*5*7*11*13*17). The final commenter bows down with "Seems legit. I kneel."
It's brilliant because there IS no "largest prime number" - they're infinite! Proving you know them all by casually factorizing a random number into its prime components is the mathematical equivalent of a mic drop. The prime-spotting prowess is so impressive that even internet strangers are genuflecting!