I'm a well read grad student who's bluntly honest about all things, although I try to be most honest about myself.
Grab a stranger's wrist and twist. It's rude, it's not appropriate, and it can set off a medical condition, like the cyst in their wrist.
There was nothing I could do but go in the backroom and cry and get an ice pack to try and numb it. I normally don't need my splint at work, so I don't take it, but I wish I had today.