Yeah the standing on the left thing has been done to death but what about these beauties:
1) People who queue on the left approaching the escalator as if they are going to walk up but then stand on the right as soon as they get on
2) People who take ages getting on or off, freezing at the top and tentatively stepping off as if they are going to be chewed up by the mechanical steps of death.
3) Errr I thought I had some more. I don't.