Both actors want to see this face-off on the big screen.
The concept was first broached during an interview with Fandango correspondents Tiffany Smith and Kristian Harloff duringSan Diego Comic-Con.
Much like Lego Batman himself, Arnett was overly confident in his characters skills.

Credit: Jason LaVeris/FilmMagic; Karwai Tang/WireImage
According to him, the mini Dark Knight would do very well in a fight against Letos Joker.
He looks a little, kinda scrawny, doesnt he?
he said in the video below.
Im just saying, in a fight.
During a later interview with Leto to promoteSuicide Squad, Smith asked the Oscar winner the same question.
Anytime you want to meet the Joker in a dark alley, bring your Legos, he said.