In the new film, the actor plays a workaholic widower who changes places with his son in the run up to the holidays, and he admits he had to ad-lib and improvise - because he had no recollection of what it was like to be a pre-teen.

"I tried to channel all of those Tom Hanks moments in Big when he was eating the corn like a typewriter," Baldwin explains. "It's interesting how much stuff like that that takes the film to the next level is completely unscripted.

"Somebody walked by me with a big bowl of marshmallows at a Christmas party (in the film) and I was like, 'Let me interpret what a 12-year-old boy would do with this gigantic bowl of marshmallows at a Christmas party.' It led to me stuffing 19 in my mouth at the same time."