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Guardians of the Galaxy

Chris Pratt's evolution in "Jurassic World"

Chris Pratt's evolution in "Jurassic World"

On a recent afternoon on a Universal soundstage, Chris Pratt was regaling a group of journalists with a story about elk hunting. Suddenly, a gust of air blew through the room, toppling a giant fake plant onto a similarly giant speaker before both careened toward one unlucky reporter.

Everyone gasped but stayed in their seats. Everyone, except Pratt, who sprang from his chair with a gravely serious expression, ready to help however he could.

There wasn't much that needed doing in this case. The shrub-speaker combination missed the reporter. But there was no missing the instinct.

The perennial goofball turned leading man wasn't merely a hero on screen. Apparently, he has...