not relevant to the current discussion or situation
1. First, let's discuss the main points of the presentation before we get off topic. 2. Second, it's important to stay focused on the task at hand and avoid going off topic during meetings.
1. "I know this is completely off topic, but I have to say it: I love your shoes!" Jennifer Aniston, source unknown 2. "Sorry to go off topic, but I just have to say that I think your new album is amazing." Taylor Swift, source unknown