Denise can help; she has an array of reasonably child-proof paints to resort to ... although permanent markers are pretty tough to get off any kind of paint. Those kinds of things might best be locked up next to the guns, liquor, and chocolate.

Is the toilet thing normal for a kid his age? I honestly don't know. It's possible that he's simply expressing frustration at something, although with his improved communication skills, I don't know what it could be. Is it too early to take him to a child pshrink for an evaluation?