Punch-Out is a classic NES game that, if not the most realistic portrayal of boxing, is at least a super fun version of it. But one man was determined to make the game more realistic when he was playing it. And everybody knows real boxers don't push buttons.
So he modified a boxing dummy to include arcade buttons, allowing him to punch the dummy and have his on-screen boxer respond in kind. Sure, it's still probably not all that close to what the real Mike Tyson does in the ring, but it's a big step closer.