Hollywood actor Shia Labeouf has apologised to author Daniel Clowes by hiring a skywriting plane to spell out his message high above Los Angeles. The Transformers star was recently accused of plagiarising a graphic novel by Clowes in a short film he directed called Howard Cantour, and LaBeouf subsequently said sorry for failing to credit the author's book Justin M. Damiano as his inspiration. He wrote in a series of posts on Twitter.com, "I can't apologise enough. I'll always be sorry this happened. Trust is hard earned and I messed that up... Mr. Clowes, I can only ask that you view my apology as a stepping stone toward repairing this misunderstanding between us. I'm sorry." The actor returned to Twitter this week (beg30Dec13) to reveal he had hired a skywriting plane to hammer home his message. He posted a picture of the five-mile (eight-kilometre) long apology, which read, "I am sorry Daniel Clowes" along with the caption, "Cloud: - vapor floating in the atmosphere - remote servers used to share data - to make less clear or transparent." Bosses of the company which provided the plane also shared pictures of the sky message on Twitter, adding, "Shia LaBeouf apologises in LA to Daniel Clowes using our skywriting team! 5 mile long apology. That's a big sorry!"