Brian Williams, De Niro square off at Tribeca

Robert DeNiro attends the premiere of "Nice Guy Johnny" as part of the Tribeca Film Festival in New York, Friday, April 23, 2010. (AP Photo/Charles Sykes)

April 23, 2011 7:58:16 PM PDT
At the Tribeca Festival, Brian Williams attempted a challenge: interviewing Robert De Niro.