Is this what heaven feels like? Or maybe the other place?
Worst Case: String theory's basic assumptions are violated. The LHC will be the first particle accelerator capable of allowing scientists to study W bosons, the elementary particle responsible for the weak force. If they don't scatter in certain ways, it'll be back to the drawing board for a generation of string theorists, or as one physicist told New Scientist, "If we see these violations, people will start working very feverishly on some sort of alternative that will produce these violations."