I didn’t realize this, but when you use the Trackback feature to reference someone else’s post, and you place their trackback URL in your “URLs to Ping” box, you should always use DRAFT mode until you are satisfied with your post. If you do what I do and publish, then go back and edit and republish, it will put that many more trackbacks on the other person’s trackback list.
So my apologies to Acidman! My post pinged him three times. (Good thing I only made — and corrected — three of my typos. It could have been worse! ha ha ha!)