I doubt the guy was drunk when he built it, so he put some consideration into it. I guess he figured that a couple of inflatable pool loungers at the bottom was MORE than enough.
If my ears don't mistake me, I think he was crying even prior to the second-to-last head thud.
Link: https://mishaptube.com//video/5077/with-dad-making-his-own-water-slide-rwhatcouldgowrong/