GALLERY: Anchorman 2 London premiere

Steve Carell found Will Ferrell "almost impossible" to work with because he's so funny.

The 51-year-old actor didn't hesitate to sign up for 'Anchorman 2: The Legend Continues' as he had the "best fun" ever working on the original movie in 2004, but struggled to keep his composure while filming some of the hilarious scenes.