Laughter Yoga and I recently heard about it from one of PT's ex-wives.
I can only assume that she thought it was something that might benefit my sad hermit ass so, after getting the gist of it from their web site, I gave it a try around my relatively sound proof little house. And you know what? I think there might be something to it.
I've always given my human plumbing and electrical system credit for having an intelligence that it might not possess. I now suspect it either doesn't know or doesn't care about the difference between a real laugh and a faked forced laugh. The heart, stomach, lungs, endocrine system, none of them know wit from shit. If I'm laughing they're thinking, man we're really having fun now.
It's been credited with health and immune system advantages. We'll see, but don't look for me at one of their laughing clubs. Being a hermit is all the fun I can handle.