"It's because it's fun, and also I like the challenge," Keaton told UPI, then, referring to his latest film, added: "It's bare bones. I'm just being an actor. I'm a guy who got hired to be this character and show up in the morning and go to work. That's it."
The "Mr. Mom" star and former "Batman" said he had no cushy trailer and was paid almost nothing to star in the film, which had a budget of about $500,000.
"I liked shooting in New York and the fact that my dressing room was a stool," he explained. "I went and got one of those blow-up sleeping bag pads so that I could lay down and take a nap. It was so small a budget, I was afraid someone would walk by and just assume I had passed out. They wouldn't associate it with me taking a nap during a movie. They would say, 'His career has really fallen apart.' I would try to find a little doorway to lie down out of public view."
Celebrity Breakups and divorces of 2014 [PHOTOS]