... like my prinicpal, who makes intercom announcements stating that he'll be making an intercom announcement later...

When I attended Camp Lutherwood on the shores of Lake Sammish as a young lad, the camp director would ask, at the end of supper, if anyone had any announcements, and Pastor Piehl would always stand up and solemnly say "I wish to announce that I have no announcements." I'm not sure what else I learned in all of those years at that summer camp, but that recollection has certainly lasted forty-plus years.