The plot of the new movie Gravity is about the worst thing that could happen to an astronaut floating in space. Space travelers have been performing spacewalks, or EVAs (extra-vehicular activities) since Alexey Leonov emerged from the Voskhod 2 spacecraft for a few minutes in 1965, and not all of them have gone as planned.
The real-life close calls are just as tense as any movie, except that we often learned about them after they were over. Popular Mechanics has a slideshow telling the stories of ten EVAs in which something went wrong -and for a while, things were really tense among those who were in the know. -via the Presurfer