MTV Movie Awards: Natalie Portman In 'Black Swan,' Steve-O In 'Jackass' And More Fight For Best Jaw Dropping Moment

It's not always easy getting the audience's jaws to drop over the course of a movie, but some of this year's outings really kicked things up a notch or twelve. Really, cutting off one's own arm in order to survive? Completely rearranging reality with just the simplest of thoughts? Flying through the air in a porta-potty filled with you-know-what?

Yeah, it's been a weird year for Jaw Dropping Moments, and we're putting the incredibly difficult task to you, the 2011 MTV Movie Awards voters: which moment was the best? Read on for all of the contenders, then make sure to place your vote for Best Jaw Dropping Moment today!

Natalie Portman, "Black Swan"

If you thought that Nina Sayers was extreme during her steamy kiss with dancing colleague Lilly, you have no idea how intense she can get: and it all starts with one seemingly innocent hangnail.

Leonardo DiCaprio and Ellen Page, "Inception"

It isn't always easy to tell what's real and what isn't, but when the entire world starts coming apart at the seams around you without even batting an eyelash, it's a pretty safe bet that you're in the dreamy imagination of Christopher Nolan.

James Franco, "127 Hours"

He can act. He can write. He can direct. He can teach. He can host awards shows. And he can cut off his own forearm with a dull knife in order to save himself from certain death. Really, is there anything that James Franco can't do?

Justin Bieber, "Justin Bieber: Never Say Never"

The "Baby" singer proved his big-screen worth this year with the hugely successful 3-D documentary "Never Say Never," and Justin's gonna get his shot at MTV Movie Awards glory for his jaw-dropping performance in the concert doc.

Steve-O, "Jackass 3D"

Really, what could be more jaw dropping than flying through the air in a porta-potty filled with feces? Depending on how you vote, the answer might be "nothing."

Cast your vote for BEST JAW DROPPING MOMENT at the 2011 MTV Movie Awards today!