Meeting is about X. If someone rolls in and only wants to talk about Y they are one or more of these things, a) clueless, b) unprofessional, c) disrespectful of

Meeting is about X. If someone rolls in and only wants to talk about Y they are one or more of these things, a) clueless, b) unprofessional, c) disrespectful of others time. But what typically happens is people get excited and have ideas. That's great, but focus is key and people need to be reminded. TBH, I don't even see any art in shutting it down. I get excited about ideas and can head off on tangents. The meeting runner (or anyone else) should call me out, and get us back on track. And when this happens, I apologize and thank them for the reminder.