This is something that has bugged me for a long while, and I really have no clue as to what is the polite way to handle these situations.
For example: You're sitting at a round table of 6 people possibly at a restaurant*. You ask the person across from you a question. They answer, then other questions are asked and spin-off conversations ensue, such as the person next to you makes a side comment directed to you, somebody else starts talking to the person next to them, etc.
Then before you know it the person across from you (PAFY) is talking to the person next to them about the subject that you are interested in hearing about while you're politely trying to converse with the person next to you who went off on a tangent.
I would think that it's impolite to cut off the person next to you saying "Wait, I would like to hear PAFY's response." Pretty much saying "I want to be a part of THAT conversation, not this one."
I understand that in a group situation it's not only one person talking, then another making a comment then someone else has the floor, while everybody else keeps quiet until it's their turn to talk.
Especially if you're seated next to an "It's all about me talker."
How do you politely stay involved with the conversation that's going on across from you?
*6 people, round table and restaurant (where you can't change seats) is a random situation.