You will not explode if exposed to hard vacuum.
At this point the victim would be floating in a blue, bloated, unresponsive stupor, but their brain would remain undamaged and their heart would continue to beat….
Without intervention in those first ninety seconds, the blood pressure would fall sufficiently that the blood itself would begin to boil, and the heart would stop beating. There are no recorded instances of successful resuscitation beyond that threshold.
Exposure to the Dyson vacuum has similar effects.
Not So Fast 
I wasn’t too worried about the exploding… I am more worried about the blood boiling thing…but really, that wouldn’t stop me from going to space if anyone is buying me a ticket.
The bright side is that you’d be in an unresponsive stupor when it happened. And, you’d make the news.
Yeah, on the surface that sounds cool, but it would probably be some fluff piece that would have some crazy liberal slant. I blame Bush.
lol.