It is just one of the tools of the actor's trade: the ability to give that look that says “O.M.G.” The 100-foot tall beasts in "Kong: Skull Island" may look real, but of course, they're not.

“Really it's just a green screen and a tape mark,” Brie Larson said.

To give their best “O.M.G.” looks, both Tom Hiddleston and Larson pulled from real life animal encounters.

“There was a time I was in India,” Hiddleston said. “I saw a tiger in the wild and it was so beautiful and also so terrifying.”

“The first time I got up close to an elephant I was very conflicted by the experience,” Larson said. "It was this incredibly beautiful, gentle creature but you also get this sense of power."

British actor Toby Kebbell can do awe on-demand, but in his first encounter with Kong, he delivers what might be one of the great movie lines of the year: “Is that a monkey?”

The line -- featured in trailers and commercials -- was completely ad-libbed.

“They said ‘What would you say when you see this huge giant monster and he comes at you and ACTION!' and I was like ‘Is that a monkey?’ and that's what it was," he said

The shoot took the cast six months in three different countries: the state of Hawaii, Australia and Vietnam.

“We were all thrown together away from home in these far flung places and we bonded together very fast,” Hiddleston said.

“There was a lot of downtime,” John Goodman said. “The kids couldn't get to their phones because there wasn't much reception.”

They all started gathering for something called "Brie-kends", organized by Brie Larson.

“These are these weekends that I would plan just something so we could have some fun,” Larson said. “We went to laser tag. We went go karting. We had barbecues. We held baby koalas. I like to do fun things on the weekend and explore the city I'm in.”

“It was really fun,” Hiddleston said.

You'll have fun watching "Kong: Skull Island," a rollercoaster ride full of giant monsters and perhaps one very subtle message.

“We live on this beautiful planet and we have to be protective of that and to let it be,” Hiddleston said.

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