The following are some not-so-common C declarations :
 
     auto accident;
     register voters;
     static electricity;
     struct by_lightning;
     void *where_prohibited;
     char broiled;
     short circuit;
     short changed;
     long johns;
     unsigned long letter;
     double entendre;
     double trouble;
     union organizer;
     float valve;
     short pants;
     union station;
     void check; unsigned check;