[Adam]

I'd like to add something here. Newer refs are bound to struggle with advantage/disadvantage and how to apply it to contact.
Normally, newer refs tend to whistle more contact than is necessary, and tend to call phantom fouls. Then, A/D comes into play and they sometimes err on the other side and allow a little too much contact. Judgment gets better over time.
If you happen to have a ref who is newer and perhaps letting too much contact go, and you think you need to address it, try something simple and respectful; perhaps during a timeout.
"Hey, these aren't college kids, and I think more contact could be called on both sides."

I'll reiterate the other comments, though. Don't try this before a game. It won't work.