Its really annoying sometimes.....

Have you ever been in a meeting where a few individual(s) keep delaying the progression of the meeting by asking very unnecessary questions.. Some still go ahead to ask questions even after been pleaded with, to suspend their questions till the end of the meeting. Sometimes, I just wonder what kind of behaviour is that. For me, I'm uncomfortable whenever I see such people in meetings.... You can share your experience, if you've had any... Thank you.