It looks to be a shower chair. Or a non-shower chair inappropriately used as a shower chair. Instead of, you know, not bothering with any kind of special seat and just standing there. I've only seen a handful of people shower, so I'm by no means an expert, but my understanding is that the vast majority of people just stand.
Plenty of old and/or disabled people can't stand for that long, especially on slippery surfaces like showers can be. My mother used a fancy shower chair for the last couple years before she died.
Do you wear underwear in the shower? Maybe we need to post this shit as a warning to the aging gunforge population? Those holes seem to be a bit small for me, but not all balls are created so they do not slip into tiny holes as assault rifle and pick up truck purchasers are all too well aware. Shower chairs are something that happen as you age.
Swamp Thing can send his spirit through the plant afterlife, posses a seed, and speed-grow a new body out the other end. Stuff like this happens when he passes through too fast, and only leaves behind parts. There's probably a screaming set of teeth in a corn cob somewhere.