Still Crazy

I mentioned yesterday the largely contented cardinals in our north scratch ground.  I didn't mention that at least one male is not contented.  He is in fact still obsessed with the territorial imperative.  I watched this crazed fellow a bit on Sunday.  He was attacking the rear view mirrors of a neighbor's vehicle---something all of the neighborhood cardinals were doing all spring.  I suppose not all of them have quite reached non-breeding mode after all!  It is also terribly interesting that only the cardinals manifested this particular behavior: seeing other males in the mirrors.  And as I recall, it was more widespread than any year I recall here.  Are they all crazy?  will the craziness continue?