mini-moan: turn it up to 'leven

Sometimes, well not me, but sometimes people gather in groups. It is common that when people gather in groups talking may occur, it's a concept that is alien to me but I read about it somewhere.

Where this falls apart is when somebody speaks really quietly. So quietly that you aren't actually sure they are talking but you're pretty sure they must be because their mouth is moving. It's of course possible that they are mouthing along with a song playing in their head. Perhaps they have a strange affliction that causes their mouth to move uncontrollably. These seem less likely than the possibility that they are just talking really quietly, so quietly that even Superman with his 'Super Hearing' would have to proclaim "What? Can you speak up please I haven't heard a word you've said".

Then you've got another group of people that just wont shut up. You are all stood jittering about (possibly desperate for the toilet) and one individual just keeps going on and on and on about something that you lost interest in before they even started talking. Surely they can see everybody in the group is pondering various scenarios in which they murder this individual, each scenario more gory and disturbing than the last. Yet they seem oblivious to how tedious they are and just keep talking.