Scott played Hahn’s jerk of a husband in the beloved 2008 Will FerrellJohn C. Reilly movie.
Derek just won’t or can’t stop criticizing his wife.
(See the movie clip and the interview with Scott at 4:45.)

Kathryn Hahn and Adam Scott, seen here at a 2013 film premiere, played husband and wife in “Step Brothers”.Frazer Harrison/Getty
“And I just felt like such an a–hole saying that over and over.”
Will Ferrell’s Brennan is Dale’s brother, although he’s not happy about it.
Turns out, Scott is the only actor in the scene who wasn’t actually singing.
They agreed the kids were impressive, with Hahn calling them “terrifyingly good.”
“And you too,” Scott said.
“You were singing, like, you could you might actually sing.
So I was lip-syncing to someone that was singing live right outside the windshield.”
Hahn explained that they were in a studio with a green screen.
Scott joked, “It wasJustin Timberlake.”