Apparently, carbon forks can become stressed by hitting potholes, running into a curb or normal wear and tear, which can lead to fork failure where the fork can unexpectedly break during a ride. Given the state of many of the roads around Washington especially here in King County, that's scary. You can imagine the type of crash which would result from a broken fork.
Check out Mike's article. You may also want to check or have a professional check your carbon bicycle fork for signs of stress from time to time.