Did Someone Loudly Fart On MSNBC Last Night?

On MSNBC's Hardball with Chris Matthews last night, he was interviewing Congressman Eric Swalwell about impeachment when what appeared to be a rather loud fart noise was heard. Later, in a text to BuzzFeed News, Swalwell denied having anything to do with it: "It was not me!! Ha. And I didn't hear it when I was speaking." The show later tried to explain the sound on Twitter saying it was a "mug scraping across the desk."