Or maybe your arthritic hip was giving you serious grief as you walked to the escalator but you were in a hurry so you gritted your teeth and started walking up, but you have reached the point where pain has overcome your sense of grim determination and it’s one of those super narrow escalators — who designs this shit? — so you can’t get to one side and let people go around and besides you have reached your own personal fuck-the-world-I-want-to-get-off point.