While you won't explode, swell up, freeze or go through any sort of living hell, it wouldn't be the best thing you could do for your health either.
You could suffer from really bad sunburn if you're on the wrong side of the planet. Within 10 seconds you'd start experiencing swelling skin and the bends, gases bubbling up inside you due to decompression.
After about 30-40 seconds, you'll probably fall unconscious from lack of oxygen. Injuries start to build up and, after 1-2 minutes, you'd probably be dead.
One test subject at a NASA research center was accidentally left in a near-vacuum for 15 seconds in 1965. He was in a simulate environment when his suit failed.
He reported feeling and hearing the air leaking out of the spacesuit he was in and his last conscious memory, 14 seconds into the ordeal, was the water in his mouth boiling. He regained consciousness when the test chamber had a pressure equivalent to a 15,000 feet altitude.