At the daycare I work at one of the parents saw another yelling at their child to shut up in the parking lot.  She came in crying and said how horrible that was, and next time she would say something.  Sure enough, the same parent was yelling at their child (cussing this time), and she did say something to them.  This caused a debate among other parents/coworkers about whether it was her business or not.  I was just curious what others thought about this.  As a daycare teacher, I have to say something if I see that on our property.  But in the grocery store or at the library it might be a little harder for me.  I DO think it's terrible when people cuss at their children or scream shut up...but do you think it's appropriate to say something to them?