He's addressing what appears to be a police union rally and giving a rousing speech, which contains the shouted expletive "bullsh*t." Reminds me of one of my favorite TV shows.
Shouting is not "screaming."
Some people don't like the harsh word "bullsh*t" -- and I'm modifying it here with an asterisk out of my bullsh*t fear of filters -- but it's a normal and useful word. I'm sure cops appreciate it. Using it doesn't make you crazy, and I'm positive TPM doesn't think it does. TPM is simply trying to hurt Rudy's chances with conservatives so he won't get the nomination and get his chance to win over liberals. So acting like he's "unhinged" in that video is bullshit.
UPDATE: Here is some background on the context of that speech (from a NYT analysis of Giuliani and race):
... Mr. Giuliani took a fateful step that would for years prompt questions about his racial sensitivities. In September 1992, he spoke to a rally of police officers protesting Mr. Dinkins’s proposal for a civilian board to review police misconduct.MORE: After TPM attacks me for this post, I respond here.
It was a rowdy, often threatening, crowd. Hundreds of white off-duty officers drank heavily, and a few waved signs like “Dump the Washroom Attendant,” a reference to Mr. Dinkins. A block away from City Hall, Mr. Giuliani gave a fiery address, twice calling Mr. Dinkins’s proposal “bullshit.” The crowd cheered. Mr. Giuliani was jubilant.
“If you’re acculturated to like cops, you don’t necessarily see 10,000 white guys who don’t vote in the city, don’t write political checks and love you for the wrong reason,” an aide said. He spoke on condition of anonymity because he is working with the Giuliani presidential campaign.
Mr. Dinkins has not forgotten that sea of angry cops. “Rudy was out there inciting white cops to riot,” Mr. Dinkins said in a recent interview.
Mr. Giuliani said he never saw racist signs. “One of the reasons those police officers might have lost control is that we have a mayor who invites riots,” he said at the time. The Giuliani campaign later conducted a “vulnerability study” to identify their candidate’s weaknesses in 1993. This study, obtained by Wayne Barrett, author of “Rudy!” — an investigative biography — offers an unsparing critique: “Giuliani’s shrieking performance at the cop rally may be his greatest political liability this year. Giuliani has yet to admonish those who attacked the mayor with racist code words on signs and banners. Why not?”
AND: I wrote more on the NYT coverage of Giuliani and race here.