Annoyed the heck out of me

[MD Longhorn]

I'm sure that if WMB's warning is delivered in a jovial manner, it's not a bad thing. If it works for him, then great. He's obviously not going to actually call someone out randomly - but if saying so, in a joking tone of voice, gets the point across, then more power to him.

I'd hope he'd never say that in a tournament or playoff game, but then again - one would also hope you had three umpires for those games, and working with one should never happen.

I've used the following often in adult slowpitch when working alone.

"Coaches, I can only see your baserunners in my peripheral vision. Tell them to stay put before the pitch. If I even THINK someone left early, then they left early, and they're out. And I don't want any arguments from you if that happens." Usually takes care of it - and I can't recall actually having to call someone out for this when I was by myself.