Here's what Mr. Petersen wrote in his Rivendell Reader in 2009:

"Carbon (sic) is amazing, unpredictable stuff About two years ago we had a fork fight, like a sword fight. Not the people-poking kind just whacking a carbon fork against a steel one while pretending they were swords. After about fifteen blows, the steel fork dented, and repeated whacks folded it over 90 degrees. At that point the carbon fork appeared unharmed, so I threw up."

But you're right, in the years since he's figured out how to dramatically stage carbon fiber failure by cutting through the tubes before whacking them.

"I notched the carbon fork and the steel one, and one more whack sent a ten-inch section of the carbon fork flying."

Sorry, don't mean to derail the OP's lock question.