I heard the most fab story about PFBs - an ex-colleague of mine told the story about when they were invited to a couple's house for dinner - they had a child at the same playgroup as my colleague. As the dinner went on, the conversation moved on to the extreme lengths some people go to to provide an elaborate party. My colleague regaled them with the tale of someone he knew who had hired a boat for his child's 2nd birthday. He spoke with ridicule of how it was ludicrous, total waste of money, etc etc etc. He kept saying 'I can't remember who it was - can you?' to his wife who replied by shaking her head. Eventually he said 'I know - it was some clown at playgroup.'
When they left, his wife said 'Why did you go on and on about that boat? It was THEM.' He said 'well why didn't you stop me?' and she replied 'I was kicking you hard throughout' - 'no you weren't' - she had been kicking the host hard, all the while my colleague was insulting their party!