Chris Brown has been on and off of Twitter recently, but when he's on, we don't doubt he's definitely on something. The expert in all things related to fists and Rihanna's face has had his fair share of Twitter meltdowns. When responding to comedy writer Jenny Johnson calling him a "piece of shit," Brown took things up a notch and responded for all the world to see: "@JennyJohnsonHi5: I know! Being a worthless piece of shit can really age a person. take them teeth out when u Sucking my dick HOE." And they say chivalry is dead.