In 1998, a man in Denver took a risky leap by investing in 120,000 plastic cups from Japan, rendered useless for drinking due to holes drilled in the base. These cups turned into a booming business as they were transformed into a phenomenon known as sport stacking, where kids stack cups into patterns for fun. The man, a former clown and PE teacher, and his wife founded a company called Speed Stacks and traveled tirelessly to promote the sport. This unlikely business venture became a surprising success story, proving that passion and hard work can turn even the most ludicrous idea into a thriving enterprise.
https://defector.com/if-you-ever-stacked-cups-in-gym-class-blame-my-dad