Bill Hader and Ben Schwartz Are the Unlikely Voices Behind BB-8 in 'Star Wars: The Force Awakens'

— -- You'll never guess which actors are behind the voice of BB-8, the lovable rolling droid in "Star Wars: The Force Awakens" -- "Trainwreck" actor Bill Hader and "Parks and Recreation" actor Ben Schwartz.

Although it was no big secret -- the two are both listed as BB-8's vocal consultants in the film's credits -- neither has spoken out about their involvement until now.

Hader told HitFix that he and director J. J. Abrams created the voice by using "this sound effects app on his iPad that was attached to a talk box operated by me. It looked ridiculous but it made BB-8's voice."

Hader said it took a couple of tries to perfect BB-8's machine-sounding voice.

"At first I tried doing a voice, but we all agreed it sounded too human," he explained.

Schwartz, who had been keeping his involvement in "Star Wars: The Force Awakens" close to his chest, tweeted that "nothing makes me happier" than being BB-8's voice consultant. He added, "This movie is amazing."

"Star Wars: The Force Awakens" is produced by Lucasfilm, a subsidiary of Disney, which is the parent company of ABC News.