What involuntary things happen when you orgasm? Do you moan, shake, curl your toes, etc?

I once had a fully body organs that made my calves cramp lol

I don't think I had a reaction that I can't control besides cumming and well, gasps. I have yet to see if that sort of stuff is true.

EDIT: Not sure if involuntary, but I def curl my toes and push as hard as possible.

Depending on how hard I orgasm, I usually moan and twitch.

I usually moan and shake a bit depending on how hard I orgasm

If it's a good orgasm I tend to moan and shake a little