Will Arnett uses his "Batman voice" to tell off his children.
The 48-year-old actor is the man responsible for providing The Caped Crusader's speech in 'The Batman Lego Movie' and the two 'Lego Movies' and his deep, serious tone is the perfect pitch for disciplining his two kids, nine-year-old Archibald and seven-year-old Abel, when they misbehave.
Speaking at the 'Teen Titans Go! to the Movies' event, he said: "I don't yell at my kids when they're bad. I just don't. I don't believe in it.
"I will sometimes say, 'Guys, turn off the iPad,' and when they don't, I'm like, [in my Batman voice,] 'Hey, turn off the iPad.' And that usually works."
Will - who shares his children with ex-wife Amy Poehler - voices the role of supervillain Slade, the nemesis of Robin, in the new animation film.
The movie is inspired by the DC Comics characters of the same name and the Cartoon Network TV series and Will admits he accepted the part to impress his kids.
He said: "I got involved with the movie because my kids are fans of the TV show, and I would hear it from the other room (at home) and I'd be like, 'What is that?' Usually you hear kids' shows, you're like, 'Oh my God,' But I was like, 'This is hilarious!'"
Speaking to Extra, he also revealed that it was "fun" playing the bad guy and taking a break from his superhero persona in the Lego films.
He added: "I like the idea of coming off the 'Lego Movies', I get to play a superhero who is kind of flawed and now I get to play a supervillain who is very flawed. It's fun cause I don't have to worry about doing the right thing, I'm actually just trying to do the wrong thing and that's kind of fun."
In 'The Lego Movie 2: The Second Part' - set for release next year - Will is reunited with castmates Chris Pratt, Elizabeth Banks and Alison Brie.