Basketball

There are a lot of reasons time machines aren't worth it, but going back in time to dunk on Dr. James Naismith as he invents the sport of basketball with peach baskets is one reason to tinker with the timeline. Literally every basketball fan in the world would literally jump at that opportunity, and there are basketball fans a surprising amount of places. There are bear-wrestling basketball fans. Basketball is beloved by comedians. The Looney Tunes try hard at basketball. Even North Korea's Kim family reinvented basketball. The sport just has amazing fans the world over. Except that guy who rigged NBA Jam. We're still bitter about that guy.