Exposure to space without a spacesuit
The human body can briefly survive the hard vacuum of space unprotected,[2] despite contrary depictions in much popular science fiction. Human flesh expands to about twice its size in such conditions, giving the visual effect of a body builder rather than an overfilled balloon. Consciousness is retained for up to 15 seconds as the effects of oxygen starvation set in. No snap freeze effect occurs because all heat must be lost through thermal radiation or the evaporation of liquids, and the blood does not boil because it remains pressurized within the body. The greatest danger is in attempting to hold one's breath before exposure, as the subsequent explosive decompression can damage the lungs. These effects have been confirmed through various accidents (including in very high altitude conditions, outer space and training vacuum chambers).[3][4] Human skin does not need to be protected from vacuum and is gas-tight by itself. Instead it only needs to be mechanically compressed to retain its normal shape. This can be accomplished with a tight-fitting elastic body suit and a helmet for containing breathing gases, known as a Space activity suit.

Oddly enough, I was just thinking about this 5 minutes ago while taking a dump.

If you hold a lungful of air, you can survive in the total vaccum of space for about thirty seconds. However, what with space being the mindboggling size it is, the chances of being picked up by another ship in those thirty seconds are two to the power of two hundred and seventy-six thousand, seven hundred and nine, to one against.