In short: no one is really sure what would happen. The general consensus is that it probably wouldn't be good.
But here's a post from the Bad Astronomy blog and video that explores the subject! Well, at least the first four minutes explores sticking your hand in the beam, the remainder is on some interesting stuff if you're a science geek.
http://blogs.discovermagazine.com/badastronomy/2010/09/21/dont-cross-the-lhc-stream/
http://science.slashdot.org/story/10/09/25/2150228/Dont-Cross-the-LHC-Stream-Maybe
But here's a post from the Bad Astronomy blog and video that explores the subject! Well, at least the first four minutes explores sticking your hand in the beam, the remainder is on some interesting stuff if you're a science geek.
http://blogs.discovermagazine.com/badastronomy/2010/09/21/dont-cross-the-lhc-stream/
http://science.slashdot.org/story/10/09/25/2150228/Dont-Cross-the-LHC-Stream-Maybe