I have a few friends who show clear indecision on when to enter or leave a conversation. I have a friend who when I tell him that I am about to leave my room for a meeting or class, will repeatedly walk out of the room but then re-enter contemplating whether to enter the conversation. I sometimes show similar indecision, but I usually realize when I can't make up my mind, and I stop and try to make a decision as quick as possible whether to continue a conversation, staying in someone's room, etc., or to just end doing it.