If you used Twitter this past Sunday, chances are, you noticed #gorillapenis at the top of the Trending Topic sidebar.

It turns out that this is none other than the work of 4chan, the imageboard website responsible for numerous pranks on the internet that include Youtube Porn Day and the sabotaging of a Time Magazine poll of “The World’s Most Influential People,” which resulted in voting 4chan a.k.a. “moot” atop the list by a monumentally wide margin of victory.

4chan is primarily known for posting and dicussing manga and anime. It is also responsible for having coined such internet memes like “lolcats,” “rickrolling” and “chocolate rain.” Its random board, called /b/, is the notorious but most popular section on the webpage. At the moment, it seems that the site is currently down and unavailable for browsing.

As for the attack on Twitter, which 4chan dubbed “Operation Sh***er,” 4chan and eBaum’s World enlisted like-minded pranksters to sign up for fake Twitter accounts and spam the website this past weekend. The end result seems to point in the direction of a controversial but unanimous victory.