From "Inside the Phone-Throwing Drama at the Troubled, Broke Democratic Party/The Democrats should be well positioned to make gains in this year’s midterms. But inside party headquarters, every week brings paranoia, worries about money and, on occasion, emotional eruptions" (NYT gift link).
Just 5 days ago, we were talking about how unusual it is, in a work environment, for someone to throw something. I blogged a story about Troy Jackson, now the Democrats' candidate for Senator from Maine, who, according to WaPo, "once angrily threw a water bottle in a meeting after he couldn’t persuade a lawmaker to vote his way." I asked: "Have you ever thrown anything as a way of expressing emotion? Even in a private, non-work environment? It's some kind of red flag, throwing things. Who does that?"
Various answers in the comments over there, and now we have a new answer: Ken Martin.
Video of Burns playing the bazooka 