Possible Charter challenge
Emma was the one who suggested that maybe this was an expression of hostility, because Yin doesn't really like James much - he doesn't do anything to her, but he's loud and abrupt and she can't relax when he's around. When I mentioned it to Dean, he said that in that case, this moved the poop into the category of Political Speech, which, as we all know, is protected under the Charter of Rights and Freedoms.
The more I thought about it, the more I became convinced that this could be the basis of a challenge to the Charter. Just think: Mr. A habitually takes his dog to do her business on Mr. B's lawn, and refuses to stop. When Mr. B finally resorts to the law, Mr. A can claim that his dog has never liked Mr. B because he yells at her, and so this is her way of expressing herself. Ah, you may say, but defecating is not SPEECH - it's just a natural bodily function! Then Mr. A could bring up the well-documented habit of dogs and wolves to urinate to mark their territory, thus establishing that elimination is in fact a method of communication. And he might even dare to mention "Piss Christ" and the Dung Madonna (since our courts are always thrilled to follow what the rest of the world is doing), and that story about apes having rights in Spain, and voila!
This would never fly in the U.S., where you have a REAL constitution, but up here in Canada, a few judges are just making ours up as they go along, so anything could happen.