Robert Osborne's 20th Anniversary Tribute

Comedian Kevin Hart performs in front of a crowd of 50,000 people at Philadelphia's outdoor venue, Lincoln Financial Field.

Celebrating the 30 year anniversary of Michael Jackson's solo career, this legendary performance took place on September 10, 2001.

Trey Parker and Matt Stone celebrate South Park's 25th anniversary with a concert in Colorado, featuring Primus and Ween.

Bruce Willis goes from "Die Hard" to dead on arrival as some of the biggest names in entertainment serve up punches of their own to Hollywood's go-to action star. And with Roast Master Joseph Gordon-Levitt at the helm, nobody is leaving the dais unscathed.

David Letterman vies with Jay Leno and his manager to succeed Johnny Carson, retiring from "The Tonight Show."

David Blaine's signature brand of street magic mystifies the most recognisable celebrities in the world, such as Jamie Foxx, Bryan Cranston, Aaron Paul, Ricky Gervais, Katy Perry, Woody Allen, and Robert DeNiro, to name a few. He goes to the homes of Kanye West and Harrison Ford, Will Smith and Olivia Wilde. He pays a visit to Stephen Hawking at his office in Cambridge University. Blaine also travels the world, astonishing people from all walks of life with never-before seen, inconceivable magic.