and Jennifer Aniston
are feuding over science!
While filling in as a guest host for Jimmy Kimmel
-- who's out following his son's most recent heart surgery -- on Jimmy Kimmel
Live! on Thursday, the comedian hilariously debated with Aniston over whether gravity is real or just a hoax, mocking the issue of global warming.
"As you know, there has been a lot of talk these days about the environment, our changing climate and global warming. As some people say, it's real. And then the really smart people, they know it's a rouse, invented by the Illuminati," jokes McCarthy, who was dressed as a giant menorah. "But there is an even bigger issue facing our planet, one that has gone undebunked for hundreds of years."
The clip then flashes to a video of "famous person Melissa McCarthy
" who explains, "There's a subject the mainstream media doesn't want you to hear about."
"They say we shouldn't