Not weird stat: Yankees pitchers have accounted for 4 of the 24 perfect games in MLB history.
Weird stat: All 4 Yankees pitchers who have a perfect game have a first name starting with the letter "D"
"I don't know coach, it's my first game - let's find out together!"
Ok, maybe not that - but it would be tempting :). Like beerguy55 said, just say a standard book zone. Like you mentioned, it's a dumb question. They'll figure it out soon enough.
Saw it called - and fully agreed - in a game this weekend when I was BU. Like this one, the batter 'swung' after the catcher already caught the ball and was on his way up to throw. By rule, once the catcher secures the ball, the pitch is over - can't very well strike at a pitch that's already over. No prob nailing this as BI if it even remotely impacts the play.
That one really isn't an NFHS thing (at least not yet, not in baseball)....but many states have made it a state adoption. From what I gather, these include MI, NC, PA, NJ, NY, NV, but I'm sure there are others.
Who's "everyone"? I don't think i've ever seen this in person with a partner or anyone else at the HS level or below. I don't think this is really all that common anymore, even at the higher levels.