Taylor Swift explains why she's so surprised all the time

Taylor Swift, 22-year-old megastar, owner of six Grammys, 10 American Music Awards, and the highest-paid entertainer in the world under 30, is possibly best known for one thing:

This. Her amazing ability to basically unhinge her jaw, like the most adorable python or mouth-breather you ever did see.

For example:

When Taylor Swift wins a Grammy, she looks like this.

When Taylor Swift gets slapped on a magazine cover, she looks like this.

When somebody gives Taylor Swift a novelty surfboard, she looks like this.

But, if somebody asks Taylor Swift about why shes so surprised all the time, she looks something like this.

ABC News Nightline joined Swift on the set of a recent magazine shoot, and interrupted their girl talk sesh about vintage purses and whatever by asking about why shes so darn surprised all the time.

Nightlines Cynthia McFadden: So that look that you give, that I won look

People make so much fun of me for that, Swift interjects.

And they do from Saturday Night Live, to Blake S! helton a t this years Country Music Awards, to, well, us on multiple occasions.

And I just, I dont know. Its like, if you win an award, isnt that crazy? Swift continues. How do you sit there and be like, Oh, another Grammy. I guess Im gonna get that now?

I try to be sometimes, but its just hard when you get excited about stuff.

Like dubstep, apparently. Because when Swift told Rolling Stone that some of her upcoming album, Red, will take cues from Skrillex well, we looked a little something like this:

Watch Taylor Swift on Nightline: