We've all had days like this, when basic tasks become unfathomably hard, and the more something goes wrong the less you understand why it's going wrong. You're ambling down the street perfectly normally, when all of a sudden your brain goes all fuzzy and you forget how to walk properly, and you end up splayed against the plate-glass shopfront of Guineys with middle-aged ladies pointing at you. Or you can't remember how yoghurt works, and find yourself trying to punch your way into a Müller Fruit Corner before scooping it out with your phone.
Or, as in this case here, a simple escalator turns into a puzzle of nightmarish proportions.
The good thing is that, when it's happened to us, nobody's put the CCTV video of it up on the internet. Well, not yet, anyway.