I like a good mystery, such as the perennial favourite 'What train am I on?' and the related 'What platform is my train on?'

Tonight they had moved my train to platform 1, which you can't get from the side entrance of New Street Station, so I had to walk along the platform, up the stairs to the central concourse, then down the steps to the platform itself. The screen there still announced the imminent departure of a different train, and the platform was full of people waiting for that train til the tannoy announced that it had been moved to yet another platform.