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When your girlfriend's dad (or your dad, if you're the girlfriend) yells at the boyfriend like he just stole the last slice of pizza. He might even pull out a knife or a gun to make the point clear. It's all about the don'ts, mostly.
My dad pulled out a knife and said, 'If you hurt her, I'll hurt you.' I thought he was going to kill me.
My girlfriend's dad threatened me with his gun and said, 'You mess her up, I'll mess you up.'
My boyfriend's dad came at me with a machete and said, 'You better treat her right or I'll cut you up.'