Chang W. Lee/The New York Times

Representative Anthony D. Weiner came to Sheepshead Bay, Brooklyn, to resign from Congress, and Benjy Bronk came to steal Mr. Weiner’s glory, if it could be called that. Fortunately for Mr. Bronk, no one was checking press credentials at the door.

Midway through Mr. Weiner’s four-minute speech Thursday afternoon and moments after Mr. Weiner had announced his resignation, Mr. Bronk, a writer and performer from “The Howard Stern Show,” leaped from his seat in the crowd and began to heckle the New York congressman, asking crude questions about the now-famous picture of Mr. Weiner wearing gray boxer-briefs.

The crowd — a group of nearly 200 members of the news media and senior citizens — tried to quiet Mr. Bronk as Mr. Weiner, looking drawn and skinnier than usual, pressed on with his announcement and tried to speak over the jeers. Mr. Weiner is known for relishing a good back-and-forth, but on Thursday the congressman was subdued as Mr. Bronk interrupted him, and he continued speaking even as the room’s attention turned from him to the noisy interloper.

At one point, a woman came over to Mr. Bronk and threatened to summon the police, but Mr. Bronk persisted with a third outburst at the end of the press conference.

“Will you maintain your hot physique and smooth sexy chest?” he shouted.

Outside the Council Center for Senior Citizens, Mr. Bronk, who had also interrupted Mr. Weiner’s June 6 news conference where he admitted to exchanging sexually explicit messages with six women, basked in the glow of his notoriety.

As a press crowd gathered around, Mr. Bronk, clad in a black shirt, shorts and an injury boot on his right foot, stood and grinned from behind police barricades, asking reporters to sniff his armpits (“Can you identify the way I smell?”) and hitting on a reporter from the celebrity-gossip show Extra. “You must have Jewish blood?” Mr. Bronk asked. “What are you, Spanish? Mediterranean?” (She told Mr. Bronk that she was of Greek extraction.)

“I felt so bad for him, I really did,” Mr. Bronk said of Mr. Weiner. “But I did wait until he said the words, ‘I resign,’ to ask any questions.”

Mr. Bronk held court for more than 15 minutes, veering from utter absurdity into fleeting moments of sincerity as reporters tried to press him on what, exactly, he was trying to accomplish by transforming Mr. Weiner’s already circus-like political career into utter chaos on the day he finally stepped down.

“I’m trying to get to the truth and, uh, get on camera,” he said.

Getting Mr. Weiner’s political office wrong, he added, “I am announcing my running to replace Senator Weiner.”

But while Mr. Bronk enjoyed the attention — with members of “The Howard Stern Show” standing nearby to film and record the spectacle — not everyone was quite as happy. PJ Landers, a freelance photographer who had come to shoot the resignation, began arguing with Mr. Bronk, explaining that his antics had interfered with the work of other journalists who were there trying to meet deadlines and do their job.

“It was ridiculous for him to take such a serious issue and turn it into one of his bits,” Mr. Landers said later.

Although Mr. Weiner’s office had said he would not take questions, Mr. Landers insisted that the press corps would have been able to press the congressman with at least a few follow-ups had Mr. Bronk not stolen the show.

“If that guy didn’t interrupt, the New York media would have gotten a question in,” Mr. Landers said as, somewhere off to the side, Mr. Bronk performed for yet another group.