We all know that you can't make a superhero movie these days without a few fancy special effects, given all the flying, web-slinging, good vs. evil fighting that goes on. Not so for "Captain America: The First Avenger," however, in that the standard VFX challenges on this film were the opposite of what we're used to: they had to make something big look a lot smaller.

I'm speaking of course to the slight, slim size and shape of Steve Rogers' (Chris Evans) body pre-super serum, which Evans recently revealed is almost all him.

"I'd say it's about 80 percent me," Evans said when asked how much of his body we see before Rogers becomes Cap. "We started out working on a bunch of different technologies. Something they threw out initially was, they said, 'We're going to put your head on a smaller actor's body.' I was kind of against that. I didn't feel like sharing the performance."

"I think in the beginning of the movie is when you need to fall in love with Steve," Evans continued. "You need to like the little guy. I didn't feel comfortable with someone else doing the body, body is a big piece of the acting puzzle."

So how did they make Evans look so weak and emaciated?

"They came up with a technique that is pretty amazing. For the most part anytime my character is moving it is me," Evans revealed. "They just shrank me down. If ever I'm sitting or laying down and there is no motion it's head replacement, they put my head on a skinnier body."

What do you think of skinny Cap? Tell us in the comments or on Twitter!