Claim: Will Ferrell penned Step Brothers with Adam McKay.
Evidence: He first established himself in the mid-1990s as a cast member on the NBC sketch comedy show Saturday Night Live , and has subsequently starred in comedy films such as Anchorman : The Legend of Ron Burgundy -LRB- 2004 -RRB- , Talladega Nights -LRB- 2006 -RRB- , Step Brothers -LRB- 2008 -RRB- , The Other Guys -LRB- 2010 -RRB- and Anchorman 2 : The Legend Continues -LRB- 2013 -RRB- , all but one of which he co-wrote with his comedy partner Adam McKay.
Step Brothers is a 2008 American comedy film directed by Adam McKay , written by Will Ferrell and McKay from a story by Ferrell , McKay , and John C. Reilly and starring Ferrell and Reilly.