Look back: 25 great 'Oprah' moments

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Oprah WinfreyLiberace's last TV appearance (1986)Racism in Forsyth County (1987)Oprah sheds light on the AIDS crisis (1987)'Diet Dreams Come True' (1988)Michael Jackson interview (1993)Oprah's Book Club launches (1996)Oprah's mad cow problem (1996)Ellen DeGeneres comes out as a lesbian (1997)Oprah and Dr. Phil (1998)The Mattie Stepanek interview (2001)Oprah's 'Favorite Things' episode (2002)Oprah and Dr. Oz (2004)The brand-new car giveaway (2004)Tom Cruise loves Katie Holmes (2005)Tracey Gold comes clean (2005)Oprah Winfrey endorses Barack Obama (2006)James Frey is in the hot seat (2006)Roadtrip! (2006)Oprah reveals 'The Secret' (2007)Tommy Hilfiger and the racist rumor (2007)Pregnant man Thomas Beatie (2008)Mackenzie Phillips talks about incestuous relationship (2009)Surprise flash mob featuring the Black Eyed Peas (2009)Sarah Palin visits Oprah (2009)Sarah Ferguson opens up about bribery scandal (2010)

Oprah invited the Black Eyed Peas to perform at her Season 24 kickoff party on Michigan Avenue in Chicago, but they had more than just a song and dance in store. When BEP started to sing "I've Got a Feeling," the crowd of about 20,000 transformed into a <a href="http://www.oprah.com/entertainment/Oprahs-Kickoff-Party-Flash-Mob-Dance">flash mob</a>, and the scene stunned the queen of surprises. She cried out, "That is the coolest thing ever!" as the tune ended.

Surprise flash mob featuring the Black Eyed Peas (2009)

( Kiichiro Sato / Associated Press )

Oprah invited the Black Eyed Peas to perform at her Season 24 kickoff party on Michigan Avenue in Chicago, but they had more than just a song and dance in store. When BEP started to sing "I've Got a Feeling," the crowd of about 20,000 transformed into a flash mob, and the scene stunned the queen of surprises. She cried out, "That is the coolest thing ever!" as the tune ended.

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