The basketball hoop sits at exactly 10 feet (3.05m) by accident, not design. In 1891, James Naismith needed a spot for a peach basket at a Springfield YMCA gym, so he used the track's railing — which happened to sit 10 feet up. That accident has been the world standard for 130+ years.
InventorNikola Tesla had a superstition about the number 3: he had to walk around a building three times before entering, swim 33 laps, and stay in hotel rooms whose number was a multiple of three — confessing he felt compelled to start over if he failed.
Baseball player Wade Boggs always ate chicken before games, earning the nickname 'Chicken Man', and kept roughly 80 rituals, from leaving home at the exact same minute to taking the same route every day. His Hall of Fame plaque even reads 'Legendary for his superstitions'.