Sometimes accidents happen. Hold back from getting mad or upset if it all possible, because it makes a bad situation worse. Understand that with accidents, it's usually regarding stuff for time. In the whole scheme of things, realize it's just an accident and it's not as important as you think it that is when you step away from the situation. As you step away and look at the situation you will realize it's just an accident, so make sure you respond accordingly. After all, it's the right thing to do and it models the way for others.