Will Ferrell calls out Bill O'Reilly while dressed as a leprechaun

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Will Ferrell: Bill O'Reilly Was a Sourpuss During 'SNL 40'


Will Ferrell celebrated St. Patrick's Day in style when he showed up on the Late Show with David Letterman dressed as a giant leprechaun.

While donning his all-green garbs, the comedian decided to call out a FOX News host with an Irish last name. Ferrell recalled seeing Bill O'Reilly at the SNL 40 special this past month, and said the news man didn't look like he was having a good time. Ferrell told Letterman that he was looking for audience reactions as the opening monologue began, and saw O'Reilly sitting there with his head rested on his fist, not smiling.

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"A real sourpuss," Ferrell said of the TV personality. "I don't know what he was doing there if he wasn't a fan."

Look back at the 40th anniversary show:

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SNL 40
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Will Ferrell calls out Bill O'Reilly while dressed as a leprechaun
SATURDAY NIGHT LIVE 40TH ANNIVERSARY SPECIAL -- Pictured: (l-r) Mike Myers as Wayne, Dana Carvey as Garth during the Wayne's World skit on February 15, 2015 -- (Photo by: Theo Wargo/NBC/NBCU Photo Bank via Getty Images)
SATURDAY NIGHT LIVE 40TH ANNIVERSARY SPECIAL -- Pictured: John Goodman during the Audience Q&A skit on February 15, 2015 -- (Photo by: Theo Wargo/NBC/NBCU Photo Bank via Getty Images)
SATURDAY NIGHT LIVE 40TH ANNIVERSARY SPECIAL -- Pictured: Larry David during the Audience Q&A skit on February 15, 2015 -- (Photo by: Theo Wargo/NBC/NBCU Photo Bank via Getty Images)
SATURDAY NIGHT LIVE 40TH ANNIVERSARY SPECIAL -- Pictured: Tim Meadows during the Audience Q&A skit on February 15, 2015 -- (Photo by: Theo Wargo/NBC/NBCU Photo Bank via Getty Images)
SATURDAY NIGHT LIVE 40TH ANNIVERSARY SPECIAL -- Pictured: Larry David during the Audience Q&A skit on February 15, 2015 -- (Photo by: Theo Wargo/NBC/NBCU Photo Bank via Getty Images)
SATURDAY NIGHT LIVE 40TH ANNIVERSARY SPECIAL -- Pictured: Kanye West performs on February 15, 2015 -- (Photo by: Theo Wargo/NBC/NBCU Photo Bank via Getty Images)
SATURDAY NIGHT LIVE 40TH ANNIVERSARY SPECIAL -- Pictured: Miley Cyrus performs on February 15, 2015 -- (Photo by: Theo Wargo/NBC/NBCU Photo Bank via Getty Images)
SATURDAY NIGHT LIVE 40TH ANNIVERSARY SPECIAL -- Pictured: (l-r) Amy Poehler, Melissa McCarthy as Matt Foley, Jane Curtin during the Weekend Update skit on February 15, 2015 -- (Photo by: Theo Wargo/NBC/NBCU Photo Bank via Getty Images)
SATURDAY NIGHT LIVE 40TH ANNIVERSARY SPECIAL -- Pictured: (l-r) Fred Armisen as Garth, Kristin Wiig as Kat during the Marty and Beyonce skit on February 15, 2015 -- (Photo by: Theo Wargo/NBC/NBCU Photo Bank via Getty Images)
SATURDAY NIGHT LIVE 40TH ANNIVERSARY SPECIAL -- Pictured: Keith Richards on February 15, 2015 -- (Photo by: Theo Wargo/NBC/NBCU Photo Bank via Getty Images)
SATURDAY NIGHT LIVE 40TH ANNIVERSARY SPECIAL -- Pictured: Emma Stone as Roseanne Roseannadanna during the Weekend Update skit on February 15, 2015 -- (Photo by: Theo Wargo/NBC/NBCU Photo Bank via Getty Images)
SATURDAY NIGHT LIVE 40TH ANNIVERSARY SPECIAL -- Pictured: Robert DeNiro during the New York Intro skit on February 15, 2015 -- (Photo by: Theo Wargo/NBC/NBCU Photo Bank via Getty Images)
SATURDAY NIGHT LIVE 40TH ANNIVERSARY SPECIAL -- Pictured: Jack Nicholson during the Politics Intro skit on February 15, 2015 -- (Photo by: Theo Wargo/NBC/NBCU Photo Bank via Getty Images)
SATURDAY NIGHT LIVE 40TH ANNIVERSARY SPECIAL -- Pictured: (l-r) Tina Fey, Amy Poehler, Melissa McCarthy as Matt Foley, Jane Curtin during the Weekend Update skit on February 15, 2015 -- (Photo by: Theo Wargo/NBC/NBCU Photo Bank via Getty Images)
SATURDAY NIGHT LIVE 40TH ANNIVERSARY SPECIAL -- Pictured: (l-r) Jason Sudeikis, Will Forte during the ESPN Classic skit on February 15, 2015 -- (Photo by: Theo Wargo/NBC/NBCU Photo Bank via Getty Images)
SATURDAY NIGHT LIVE 40TH ANNIVERSARY SPECIAL -- Pictured: (l-r) Laraine Newman, Bill Hader, Taran Killam, Kristen Wiig, Keenan Thompson, Taylor Swift, Fred Armisen, Kerry Washington, Betty White during The Californians on February 15, 2015 -- (Photo by: Dana Edelson/NBC/NBCU Photo Bank via Getty Images)
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The Get Hard star, 47, also shared with Letterman why he decided to dress like a leprechaun, quipping that he takes St. Patrick's Day very seriously. "Every St. Patrick's Day I put on my outfit and I walk the streets of New York educating people on the dangers of snakes," he said.


That's when Ferrell went into his hilarious rendition of "Danny Boy."

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"Oh Danny boy, the snakes the snakes are calling," he sang. "From the Upper East Side and down from China Town. Don't walk the highline and stay away from Dumbo. Because Dumbo the snakes wear skinny jeans."

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