Windows and reflections in windows.
A Russian diplomat comments as he looks through the window of his taxi in the City of London, "I see that you have the same sort of problem as we do with groups of prostitutes outside entrances to offices".
A man and dog in the Grove. The dog, a collie, holds a stick in its mouth. It appears only mildly interested as the man appears to be talking to it non-stop about problems with machinery and the importance of proper maintenance. Only after careful observation do you realise that the man must be talking into a microphone hidden in the collar of his jacket, the microphone connected to a telephone. But then again you can't be sure.