Mark Rylance has admitted he often struggles with language and makes up "gobblefunk" words - just like his character, the BFG.
Despite his background in Shakespearian theatre, Rylance said he has a lot in common with the 24-foot-tall word-mangling Big Friendly Giant.
Speaking at the film's premiere in London's Leicester Square, the 56-year-old actor said: "I'm often confused and I've had a lot of difficulty with language in my life."
He said: "As I get older I do find I'm making up words, because I forget what the right word is, and I often say the wrong word."
The BFG often muddles up his words and creates new ones, including "human beans", "whizzpopper" and "squiff-squiddled".
Steven Spielberg's version of Roald Dahl's 1982 novel sees Rylance as the kind-hearted, big-eared BFG, who kidnaps young Sophie (Ruby Barnhill) from an orphanage and takes her back to his home in Giant Country.
Rylance was joined on the red carpet by Spielberg and the film's stars, Wilton, Barnhill, Rebecca Hall, and Rafe Spall, as well as famous faces including Sir Ben Kingsley and Great British Bake Off judge Mary Berry.
Dahl's daughter Lucy Dahl said her father would have been "delighted" with the adaptation of his children's book.
She said she had seen it three times - and had been brought to tears on each occasion.
Dahl, 50, said: "The first time I saw it I cried and cried and cried. I felt like I had spent two hours with my father.
"And then the second time I saw things that I hadn't seen the first time because I was crying so much the first time, and then the third time I saw it I just saw the spectacular special effects, and dreams, and giants."
On whether anyone else could have taken on the story, she said: "It had to be Steven, without question."