Here comes the bride

One element seems universal – why is it the groom never seems to be having quite as much fun as the bride?  Even in cultures where the bride and groom have separate celebrations until they are brought together at the end of the evening, the groom never seems to be as comfortable as the bride.  While the groom often looks like he’s undergoing a mild form of torture, the bride seems to bask in all of the fuss and attention.  Could it be a case of the free-range chicken feeling like he’s being caged against his will?