Depends where you are when you find yourself in vacuum.  You will decomp in a very unpleasant way if you're left out there for longer than a few minutes, provided you're not in a particularly cold place.  Decomp somewhere relatively warm and you're in deep shit.  Probably not the spectacular explosion I suggested earlier but definitely not pleasant at all.  Air would pretty much make a mess of any soft tissues it encountered on the way out.

One of Niven's stories makes use of the idea you can survive vacuum in a cold place and use it as a survival method - basically a form of suspended animation. 

Bowman's exposure to vacuum was realistic in that he was exposed for a relatively short time and therefore lived to tell the tale.  I did, however, expect him to be deaf (ruptured eardrums), have bloodshot eyes and a bleeding nose.

BTW, I am perfectly sane.  My psychiatrist said so, shortly before I was signed off her books as being a fit and worthy human being.  Yes, I am serious.  :) 

OTOH, I have very little respect for most mental health "professionals". 

Coppula eam se non posit acceptera jocularum.

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