I got two minor warnings a short time after registering.

I got a sort of warning for linking to a rather risqué webcomic in my sig. My sig was then edited by Leeza. To my credit, it had become a lot raunchier since I had last read it. Still, it taught me a valuable lesson in what's appropriate and what's not.

I also got a warning for a rude post which also incidentally went around a filter. Once again, this was not really as bad as it could have been given the fact that it was a response to another flame pages ago which had not been edited, despite going around the filter as well. I had not yet learned the value of the "warn" button, or that the staff sometimes miss a rude post, and when someone responds to it in kind they're the one who gets the edit.

So basically I haven't gotten one of the "official" PM warnings, and I plan to do my utmost from now on to avoid that.