If you get into a fight at a ballpark, you will be ejected. Anybody who goes to a ballpark knows this, because before every game, public address announcers read a warning about conduct.
If you touch a ball in the field of play, you will be ejected. Anybody who goes to the ballpark knows this, because before every game, public address announcers warn fans about this particular cause and effect.
If you run onto the field, you will be ejected, and will be subject to a trespassing charge. Everybody knows this. Because before every game, public address announcers remind fans about what will happen.