I've read about it. Your blood wouldn't boil because it's surrounded by veins which keep the pressure in check, but most of the water from your eyes, nose, and mouth would immediately boil away and the rest would freeze pretty instantly. Without anything on your ears, your entire inner ear would burst, and that would cause enough pain for someone to pass out. It's hard to tell which is better, inhaling or exhaling, but either would end with the lungs bursting if the breath was held or collapsing if the breath was let out.
And I think we can assume that the guns in Cowboy Bebop can fire in space because of a modified mechanism or something.
That said, the main reason I was criticizing the bad science in 2012 is because they made such a big deal out of it, and the exposition explaining what causes the disasters is entirely unnecessary. They were bringing fictional science into a film that isn't science fiction. A bad film that isn't science fiction.