It's a good thing many of these stars aren't on Twitter.

Thursday's Jimmy Kimmel Live featured 14 new stars reading nasty notes they've received on the internet. "We like to shine a light on those who post cruel and horrible comments on Twitter. People can be vicious, and it hurts," host Jimmy Kimmel explained. "To raise awareness and to maybe make people think twice before they post something awful, once again we've assembled a group of famous faces, including some of our guests tonight, for this, our sixth edition of Mean Tweets."

The first start to participate was George Clooney, who appeared on the show with his Monuments Men costars. "i'm very much looking forward to the day when the world stops sucking george clooney's t--t," the actor read. "Lumpy faced basterd." Clooney's reply? "F--ck you @seauxphie."

Mad Men star Jon Hamm then read, "i'm just gonna throw this out there. i hate Jon Hamm. i hate his face. i hate his pig name. i hate how smug he always looks. i hate Jon Hamm." Dallas Buyers Club's Jennifer Garner also agreed to appear in the recurring segment. "Jennifer Garner looks like a duck's vagina," she read, looking somewhat taken aback. "Literally, a duck's t--t." Her take? "That's not nice."

Other celebrities who read mean tweets about themselves included Cate Blanchett, Benedict Cumberbatch, John Goodman, Joseph Gordon-Levitt, Tom Hanks, Rob Lowe and Sarah Silverman.

Clooney's Monuments Men costar Matt Damon then read a tweet from @jimmykimmel himself: "Too bad they don't give an Oscar for blowing ass because Matt Damon would win every year. Go buy another zoo and live in it, Bourne I-d--khead. #NODISRESPECTTOBENAFFLECK."

Which actor's mean tweet made you laugh most? Sound off in the comments below!

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