Quite, and said shouters are never talking about anything interesting that you'd actually want to overhear. It's always crashingly dull derivatives or some other mundane financial industry rubbish. The sort of conversation I've heard hundreds of times before in various airport lounges, yet those engaged in them always seem to think there's never been a conversation of more weight and importance in all of history.

More than once I've been tempted to go and tell people "you RUINED our banking system, and now you're RUINING my morning when I'm trying to read the paper"