The equipment usually isn’t sized for adults. I barely fit into the swing set at my local park, and I’m smaller than average. Even though I can technically use it, it’s very uncomfortable.
But besides that, as a grown man I’m going to get some very weird looks from parents if I waltz up to the jungle gym and start climbing with their kids. There may not be a law against it, but it’s certainly not socially acceptable.
I recently wrote a tool to make my D&D games a little easier. It’s a web app that lets you load up an encounter’s worth of enemies and keep track of their health (plus extra stuff, like legendary actions). And it does the math for you, which is a huge weight off my mental load.
It would be neat to expand it with an API that lets you load in monsters from a database and calculate the encounter difficulty, but I’m in no hurry. I don’t usually have a lot of energy to code on weekends now that it’s my full time job.
According to knowyourmeme, this is a photo from a 2018 session of Japanese Parliament. The guy in the center is calling for a vote on a controversial bill, and a bunch of opposition party members are attempting to physically prevent him from doing so. Apparently this is a thing they do in the Japanese Parliament sometimes?