He doesn’t need more cowbell. “Saturday Night Live’s” iconic “more cowbell” sketch starring Will Ferrell and Christopher Walken gets a behind-the-scenes deep dive in a new documentary – and Ferrell reveals that Walken isn’t such a fan. In the Peacock documentary “SNL50: Beyond Saturday Night” (premiering Jan 16), Ferrell, 57, recalled how Walken, 81, starred in a play several years after that famous “SNL” sketch. “I went to see [Walken] backstage, and he’s like, ‘You know, you’ve ruined my life … every show, people bring cowbells for the curtain call and bang them. It’s quite disconcerting,'” Ferrell revealed.