Today you were in my room talking to me when you suddenly took a few steps back and stood just inside the bathroom threshold. It seemed strange how you just stepped over there at random and I must have given you a funny look because you said, "I stepped into the bathroom because I wanted to say poop." (and you had in fact just said poop after stepping in)
I asked you if Mrs. MacDonald says that poop is a bathroom word and that you aren't supposed to use it except in the bathroom and you told me yes. Then you proceeded to say a few extra "poops" for good measure.