I once read a story about a retired baseball coach who spoke at a coaching convention. He had coached for decades and had retired recently, but he was the keynote speaker.
As he sauntered onto the stage the audience couldn't help but notice the full size home plate hanging from a string around his neck. It stayed there for the entire speech, but he never referenced it.
As he was closing, he finally mentioned it. He asked coaches at every level of the game, from t-ball to the major leagues, how wide home plate was.
For every single one of them, the answer was the same: 17 inches.