A Fly on the wall.
I have a friend that remembers hearing the phrase, "a fly on the wall", when he was a child. It was related to a verse in a fariy tale or rhyme. He was rasied in England. However he can't recall it's name.
I'm having very little luck with this. Help.
Thanks...I can't help with the origin, but the expression is very common in the UK - there's even a TV documentary style named after it. It means very unobtrusive observation of situations. Surely also so in the US?
Here too.