Take today. Almost empty train and I'm standing by the central pole in front of the door when she pops up on my iPod, I couldn't stop myself swinging my hips to the music as I held onto the pole to ride out the bumps. About halfway through I realise what I'm doing and promptly stop (I can't be dancing like that in public before the sun goes down! There is probably a decency law against it!). Thank God that there was only one other person on the carraige! Though he was giving me a slightly strange look as I stepped off!