Mini black holes, a possible result of the LHC experiment at CERN

Mini black holes are thought not to exist, so it's an unlikely idea anyway, and Hawking Radiation is largely accepted (but I think, not proven) . . . so maybe, "what if" concerns very unlikely but slightly valid, but there's also this:

We get particle collisions faster than Cern can produce in our upper atmosphere every day. If there was any danger of high energy collisions, We'd have likely observed it already either in our atmosphere or by Hubble. The fact that high energy collisions happen every day on every planet, every good sized moon and every star in the galaxy suggests that high energy collisions don't form into matter eating strangelets or tiny but hungry black holes. If they did, we'd have seen some evidence of that.

So we have both very strong observational evidence as well as theoretical evidence. CERN isn't playing with particle energy that doesn't happen - it happens all the time in space.

Just for fun - the Oh-my-god particle, way more energy energy than anything that happens in CERN: http://en.wikipedia.org/wiki/Oh-My-God_particle