I recently passed by a HS JV game. I knew the kid in the batter's box. He's a 16-year who has been playing baseball for 8 years now.
His dad was positioned directly behind the backstop with his nose practically up against the fence during the AB.
Literally, as the kid is in the box and as the pitcher was in his delivery, the dad is talking to the kid. "Stay back, extend through. Remember, stay back. Stay back and extend through." Like it was on a recorded loop. Repeatedly. And, it was loud enough that I could hear it from 40 feet away.
Why do people do this?