The Walls Have Ears

We were in the tearoom having one of our high level discussions (as I remember the question was "Why were the 'Yellow Bus Company' busses never actually yellow, but usually grey" - the prevailing opinion was that the yellow paint had been scraped off them and used for no-parking marks on the road).

Anyhoo, at the height of the discourse one of the large posters in the room suddenly peeled itself off the wall and seemed to be making for the door.  I hope it wasn't a statement on the quality of the conversation.