Do we need to know that Ewan

You know, there are some things we really don't need to know. Like when Ewan runs past the dining table (whilst we are eating) yelling out, "I need to do a poo!" It was only a couple of nights ago that he ran by stating he needed to do a wee. Why is it that we need to be told these things. I don't really know, however I have heard myself on occasion stating these exact same things. So on that note, I have no idea where Ewan gets these expressions.