Lately, when my son gets mad, he will hide in the hallway or his bedroom, pull his diaper or pull-ups down and pee or poop on the floor when nobody is looking. Later, we will see that there is pee or poop on the floor and have to clean it up. I know he knows to go on the potty, so he is doing this on purpose. He is just getting a cold too, so I think this is part of it. He did it twice yesterday, but has not done it today. It's a good thing we own a wet-vacuum!!!