For a couple of years there were accounts where all the comments they made had a theme, usually the username was related. That's how ShittyWatercolor started; someone would describe something in a comment and that would make shitty watercolor artwork of it.

There were tons of them. I remember another that would replace words in the comment with a link to a Magic the Gathering card where the title of the card would fill in the rest of the sentence.

There was another that would

witre cmeomtns lkie tihs 

so your brain could read them even though nothing was spelled properly.

There were a few threads where they'd Assemble like the Avengers and it would be a bunch of folks all playing off one another. It was glorious, and then it all just kind of faded away...