Matt Damon finally responded to an ongoing joke about his lack of presence on Twitter between Jimmy Kimmel and Ben Affleck. Matt's close friend, Ben Affleck, tweeted to Kimmel, "I thank you buddy. And @easterncongo & @water thank you. Matt on the other hand? Matt you there? Right. We will fax you." Damon responded by faxing the two a picture of his butt. 

Check out the fax below!