Mon Dieu! Prankster Crawls Under America Ferrera's Dress on Cannes Red Carpet

What the...?!

We've seen quite a bit of hijinks on the red carpet, but America Ferrera found herself the target of a truly outrageous prank when a man tried to slip his head under her gown at the Cannes Film Festival on Friday.

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The actress was posing for photos with her How to Train Your Dragon 2 castmates, including Cate Blanchett, Kit Harington, and Djimon Hounsou, while no fewer than four men (one wearing a Viking hat, a nod to the film) tried to pull the prankster — by the legs! — from beneath Ferrera's white Georges Hobieka dress.

The 30-year-old Ugly Betty alum was an amazingly good sport about the bizarre incident, though she definitely shot some side eye. And the look on Harington's face was pretty priceless, too. While he plays one of the best sword wielders on Game of Thrones, he seemed frozen with shock for a moment while he tried to figure out what was going on.

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So what was going on? Apparently, it was red carpet prankster Vitalii Sediuk's idea of a good time. A Ukrainian journalist, he has had strange run-ins with several celebrities. Will Smith smacked Sediuk when he tried to kiss him on the mouth in 2012. In January, Bradley Cooper was baffled when Sediuk hugged him in the crotch region. He's also the dude who charged the stage during Adele's Grammys acceptance speech in 2013 — and was subsequently banned from the Nokia Theatre L.A. Live.

He's not the only jokester causing trouble for unsuspecting celebrities at big events. Earlier this month, there was a streaker at the Met Gala, Tom Cruise famously lit into a reporter who had a microphone that squirted water in his face at the 2005 "War of the Worlds" premiere, and Kim Kardashian was flour bombed in 2012.

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And then there was Sacha Baron Cohen who was the prankster. In 2012, while promoting "The Dictator," he dumped the "ashes" of deceased North Korean dictator Kim Jong-Il on Ryan Seacrest at the 2012 Academy Awards.

Call us crazy, but it seems like some people need to work on their sense of humor.