Too much science in one place. One dodgy centimeter of wire amongst the many kilometers happened to heat up the LIQUID HELIUM COOLANT used to keep everything superconducting to boiling point blew stuff up. They waited for 1-2 weeks for everything to warm up to non-instant death temperature to fix it. Everything was fine and dandy and they smashed particles at insane energies happily every after.
But seriously, what rock have you been living under, I almost got laid when they turned it on because everyone at my school is handicapped and believed the fearmongering of all the smart people about black holes and horrible death in singularities. I forget how many years ago this was.