If you go in to edit your profile, there's a link for Personal Messge options. If you click on that you'll see that you have an Ignorelist. All you have to do is put the names of people you'd rather not get PMs from and you won't. I've never used it, but I assume it works.
I shouldn't have to put someone on my ignore list not to get what is essentially spam.
What if I want to PM wolfhowls sometime in the future?
I have no problems with PM's from him/her, I just don't want spam.
There is starting to be a definate feeling on this board that if some members want to do silly things, and you ask them to stop, you are the bad guy. Sometimes, silliness isn't appropriate or annoys people. There are enough threads for silliness, eg weird, that I see no need to disrupt ordinary threads with it, or to PM people for no particular reason.
It's annoying and if someone politely asks you stop, then that should be the end of it.