On Monday’s broadcast of MSNBC’s “The Last Word With Lawrence O’Donnell,” the host switched in and out of a fake Boston accent to try to prove a point about his working-class Boston, Massachusetts upbringing.

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O’Donnell, in response to a segment on Fox News’ “Tucker Carlson Tonight” featuring Howie Carr about O’Donnell’s and Gen. John Kelly’s respective upbringings in Boston, said, “Tucker, the next time you want someone to tell you all about Boston, get someone from Boston. It’s not that hard.”

Carr, by his own admission, is not from Boston.

The MSNBC host repeatedly exaggerated his pronunciation, saying “Tucker Carlson” as “Tuck-ah Carlson” and “Howie Carr” as “Howie Ca-hr.” O’Donnell doesn’t normally talk like this, and switches out of the accent back to his normal pronunciation quickly in the segment.

O’Donnell, a Harvard grad, nevertheless played up his working-class upbringing, saying, “I have no idea what life is like in that rich suburb of Wellesley. I’ve never spent a night there, never swam in a swimming pool there.”

This isn’t the first time the MSNBC host has done this. During the 2012 election, the host went on a bizarre rant against Mitt Romney’s son Taggart in which he used his TV show to challenge him to a physical fight, switching in and out of a Boston accent, calling Romney a “liar,” first pronouncing it as “li-ah” and then immediately falling back on his normal pronunciation.

“You want to take a swing at someone for calling your old man a liar? Take a swing at me. Come on. Come on. And don’t worry. There won’t be any Secret Service involved. Just us. And I’ll make it easy for you. I’ll come to you. Anytime, anywhere. Go ahead, Taggart. Take your best shot,” he taunted.

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