I really like the posters "men's rights are human rights' and today while playing some torchlight II it occurred to me we could start a DV campaign in a similar vein.

Have a poster saying, When is it ok to hit? And below have things like:

You are called a name? You partner doesn't act quickly enough? Someone says something you find offensive? Your partner leaves the relationship? You didn't get what you wanted, when you wanted it?

And so on, then at the bottom, "It's never ok to hit a man" and below that in smaller print., "whatever the reason"