so I did a thing with the friend from the exposed nerve meme

I don't really understand the meme
I saw this on YouTube and it was weird
I don't get it please explain

Exposed Nerve refers to a comic showing one creepy character "pulling a silly prank" on their friend which is just pulling on an exposed nerve in their arm.

Why would he pull the nerve in the first pla-
Silly prank?
Bruh

yes

pull it.

*PUULS VIOLENTLY*

I have a question, why I'd the nerve exposed like that? Dud the arm get ripped off and the nerve endings somehow stayed there? If so, that is just brutal