"No offense. I really don't mean to put you in an uncomfortable situation but you look -- you've really ballooned up," Kimmel said in response.
"Thanks, I didn't think this was about body-shaming tonight," the 43-year-old actor said.
Movement in the "fatsuit" tipped the late-night host off that there was something more going on. Sure enough, it wasn't a fat suit at all but Affleck's BFF Matt Damon, aka Kimmel's archnemesis! Just priceless.
"I just think it's gone on long enough," Affleck said of Kimmel and Damon's beef. "I think it's maybe time to bury the hatchet, man!"
"You get to decide when it's time to bury the hatchet?! Do you know what he's done to me?" Kimmel tried to reason, while Damon -- poor guy -- remained kneeling on the floor until Affleck invites him to sit on the couch.
"Wow!" Damon exclaims, as if his life has turned a page: "This feels amazing!"
"You're ruining the Oscar show, nobody wants you here," Kimmel berates The Martian star. Too bad his own audience doesn't feel the same way!