Chris Evans Scares Scarlett Johansson Silly on 'Ellen'

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Scarlett Johansson lets her guard down for one second and Captain America sneaks up on her!

The 30-year-old actress looked beyond surprised when her Avengers: Age of Ultronco-star, Chris Evans, creeped up behind her as she was talking about him during her interview on The Ellen DeGeneres Show. She definitely didn't see him coming as she jumped out of her chair and her jaw dropped!

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Evans planned out his sneak attack perfectly, coming up on stage just after Johansson -- who plays Black Widow in Marvel movie world -- was done dishing about all the testosterone on set of The Avengers movies. She told Ellen that it helps to have Cobie Smulders and Elizabeth Olsen in the franchise and that she surrounds herself with "an army of women."

"They're very delicate. …Like, Hemsworth's hair takes much longer than mine," she said of Thor star Chris Hemsworth, joking that the men aren't so macho.

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Setting up the actress, the daytime host asked her to talk about Evans and the five movies they've done together. Johansson bragged that she knew the Captain America actor "very well" ...or so she thought. Just as she got out the sentence, Evans screamed, "SCARLETT!"

Needless to say, Evans looked beyond pleased with his co-star's reaction.

When Johansson was able to catch her breath, DeGeneres had her and Evans play a game called "Avengers, I Hardly Knew Her" to test their knowledge of one another. And to the delight of Captain America fans everywhere, the game included lots of shirtless shots of Evans:

The Avengers: Age of Ultron
hits theaters Friday, May 1.

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