A Birkett
To do a Birkett is to be a loud, annoying person who thinks punctuation is the most important thing in life. They'll throw wet fish at you if you don't use commas properly.
She did a Birkett on me in class. I got hit with a wet fish.
He did a Birkett on his friends. They all cried.
That kid did a Birkett on the teacher. It was ridiculous.