The guys are up to no good for a good cause. Matt Damon sent a photo of his butt to best bud Ben Affleck and Jimmy Kimmel after a series of tweet teasing. Affleck and Damon recently submitted a video on YouTube where the two stars can be seen playfully insulting each other for charity. The promotional video for charity will give fans a chance to hang out with the stars by donating $10 which will benefit the Eastern Congo Initiative and Affleck thanked the late-night talk show host when he noticed that he retweeted a message promoting the campaign.

Hangin' out with Ben and Matt would be an absolute blast!

Hangin’ out with Ben and Matt would be an absolute blast!

Check out and support the cause.

Affleck wrote on Twitter:

“@JimmyKimmel – I thank you buddy. And @easterncongo & @water thank you! Matt on the other hand? Matt you there? Right. We will fax you,”

Kimmel wrote back:

“Matt is [probably] too scared to get on twitter because no one likes him,”

TwitterTV retweeted the post, adding the hashtag “#FaxingMattDamon”.

Kimmel then gave an update to Affleck after teasing Damon:

 “@BenAffleck – did you see what your ‘friend’ Matt faxed to us? NSFW,”

Damon’s butt pic is attached to the message which also highlights that “Kimmel has man boobs”

Image courtesy of Twitter

Image courtesy of Twitter

Affleck replied:

“Looks like u from here, Jimmy. All 4 charity?”

“#faxingmattdamon jokes aside, the kids in this story from @medium & @cironline are a reminder of why we’re doing this,”

Matt and Ben fans have time until tomorrow, February 19 to take part in the contest.