[icallfouls]

Good point Rut. In case the reference is to shooting FT's:

First one is a warning as I have to determine the intent.

Usually a simple "the next one is a violation" sends the message.

If I think the player really doesn't know the rule, then I'll go to the player and let them know that if I think that they are doing it to distract/disconcert the shooter, then they will be called for a violation if the shooter misses. I'll also let the player know that when the coach wants to know what happened, that the player and I talked about it, they did it a second time, that is the reason the shooter got another try at it.