I loved the preview cameos
... yes, they sometimes had a real DRASTIC contrast to the dark-serious episodes. Which helped me putting it into perspective, because it was telling me straight into my face "this is an anime after all, take it easy, man".
Besides, some of the cameos were unbelievably hilarious (the witches, phone-helpline ... the "chuu" ... how could you hate that??)
^_^