This happened a couple of years ago, but it's going viral again. Somebody shot video of a guy sliding down the middle divider of an escalator in London. But he gets STOPPED twice by small plastic signs that are attached to the divider.
The first one hits him right in the nads, but he starts sliding again. When he hits the next one he goes flying off the divider and onto the moving escalator.
r/Whatcouldgowrong: What Could Possibly Go Wrong? The best place to learn what NOT to do.