my favorite ones though:
FBWhichApplicationAreWe_DO_NOT_USE.h
FBProfileSetEventsCalendarSubscriptionStatusMutationOptimisticPayloadFactoryProtocol-Protocol.h
FBStoryCreateInputDataAttachmentsLifeEventExtrasEducationInfoEndDate.h
FBReactionAcornSportsContentSettingsSetShouldNotPushNotificationsMutationCall.h