(CNN) - What does President Barack Obama ask when he meets another native of Hawaii?
About their birth certificate.
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While campaigning in Florida on Saturday, the president stopped in at Gator Dockside, a Florida sports bar that boasts 19 big-screen televisions and 15 chicken-wing sauces. After grabbing a beer, shaking hands, and leading a chorus in singing “Happy Birthday,” Obama met someone from his home state.
"My young son," a woman said to the president, pointing across the table and conferring further with Obama.
"He's a Hawaiian!" Obama exclaimed, looking up to face Andre Wupperman, who now lives in Orlando and will turn 7 next week, according to pool reporters.
"Do you know how to do a shaka?" he asked, making the Hawaiian gesture with his thumb and pinky finger.
"You were born in Hawaii?" he asked the child next, then pointed at him. "Do you have a birth certificate?"
Behind Obama's grin and laughs from those nearby lie the conspiracy theories of some conservative Republicans, who maintain that Obama was not born in the United States, and is therefore not eligible to be president.
He released a certification of live birth during the 2008 campaign, and in the spring of 2011, released his long-form birth certificate. Both show that he was born in a Hawaii hospital on August 4, 1961. Contemporaneously published newspaper announcements also noted the birth in the Aloha State. Only "natural born" citizens of the United States are eligible to be president.
Among the highest-profile "birthers," as they are known, are Donald Trump and Sheriff Joe Arpaio. Arpaio, the top law enforcement officer in Maricopa County, Arizona, earlier this year held a press conference to announce findings of an investigation he led into documents.
Trump, who has endorsed and fund-raised for GOP presidential nominee Mitt Romney, threw a wrench into the Republican candidate's messaging this summer with tweets and comments, including on CNN's "The Situation Room," skeptical of Obama's birthplace.
And Romney himself raised the issue two weeks ago. At a rally in his home state of Michigan, Romney made what he later claimed was a joke about his own birth certificate.
"Ann was born at Henry Ford hospital, I was born at Harper hospital," he said. "No one has ever asked to see my birth certificate. They know that this is the place that we were born and raised."
In an interview later that day, Romney said, "This was fun about us and coming home, and humor - you know, we've got to have a little humor in the campaign as well."
Humor needs a punch line.
And Saturday in Florida, Obama was laughing.