I've NC for this.
My fiance and I were messing about, 'play fighting' and we were pushing about etc. He stuck his arse out as if he were to fart so I took my slipper off and chased after him. I threw my slippers towards him but missed deliberately. He then threw them back. (All childish I know). Anyway he called it quits. I went to shake his hand, a way we call it quits.
He then smacks my bare arm, full force with the slipper. It really bloody hurt, made me cry and my arm went bright red. He's hit me so hard that he's left the slippers tread imprinted on my arm 
He's apologised and I know he's sorry but I'm bloody angry. First of all he called it quits but then to hit me with such force?
I know this is all very childish. But we do play fight often. I'm completely shocked at what he's done.