EXCLUSIVE: Jonah Hill Says He Was 'Scared S**tless' By Leonardo DiCaprio's Crazed Fan Prank

The 'War Dogs' star opened up to ET about the hilarious run-in with his 'Wolf of Wall Street' buddy.

Jonah Hill knows what it feels like to be on the receiving end of Leonardo DiCaprio's wild sense of humor.

Recently, DiCaprio pranked Hill on a street corner in New York, running up to his Wolf of Wall Street co-star with his phone out, pretending to be a crazed fan and nearly startling his buddy half-to-death.

WATCH: Leonardo DiCaprio Epically Scares Jonah Hill by Pretending to Be a Fan

"It was funny! I was totally taken off guard," Hill, 32, told ET at a screening of his upcoming dramedy, War Dogs. "I was scared sh**tless"

The impromptu prank occurred without either actor knowing it would be caught on camera, and DiCaprio made sure to give his friend a big bear hug after frightening him senseless.

The Revenant star seems to have a wilder side in his personal life than he lets on in front of the cameras. Case in point, when James Corden texted DiCaprio from Jennifer Lopez's phone looking for nightclub suggestions on an episode of "Carpool Karaoke," and the Oscar-winner was quick to respond with recommendations.

WATCH: James Corden and Jennifer Lopez Hilariously Text Leonardo DiCaprio in New 'Carpool Karaoke'

Check out the hilarious moment of bromance between DiCaprio and Hill in the video below.