The issue of people taking their baggage aside, one passenger went down the slide on their knees because they "didn't know what to do". It's a slide, something the majority of people would have gone down in a playground (and yes, I've been down an aircraft slide before, it's not rocket science). Assuming this is the same person later referred to as having seriously injured both their knees. We're royally f'd as a species with these kinds of geniuses around.