We have a rule in our house. All bathroom doors must be closed. Why? We have a little boy who crawls, opens cupboards, goes in cupboards, climbs on top of stools, chairs, sofas, and ladders. So when I saw the bathroom door rule broken at first I was upset.
But I looked closer to the intention of this behavior and saw that his silly "big" brother does have his caring moments. I instead reminded them of the rule and helped them finish what they were doing before ushering them out.
My point, when you are an old woman living in a shoe and your kid's frustrate you; see the love behind their actions. If I had gotten upset, I would have missed this critical bonding moment between these two.