I've actually hit my friend in the face several times, by accident of course, and one time was a freak accident because I through something like a small soft ball and it went behind someone's back and nailed her in the eye. Like looking back at it even today I still don't know how the ball managed to slide behind this kid's back since he was basically right up against the wall. The other times we were probably wrestling around but we're still good friends to this day, ha, and plan to move to LA together this summer after I graduate University. So moral of the story, don't worry about it, accidents happen.