Privacy Please

Donny insists on privacy when he is using the potty. I wouldn't mind at all if he didn't lock the door and then proceed to trash the bathroom. He has shredded an entire roll of toilet paper to make snow, used my toothbrush to clean the sink and the other day, he emerged naked from the waist down holding a hairdryer in each hand ready to fire. Big Daddy and I showed him! We keep a screwdriver near the door for unlocking. Well, he has tossed the ball back to our court. He now opens the drawers to the vanity and it blocks the door from opening. When I told him to close the drawer, he replied, "NEVER!" and just laughed. Well, he no longer gets the privacy he wants, but I do sit on the side of the tub between the cloth and vinyl shower curtain. "Mama pretend you're not here."