But, naturally, being the infamous "Boy Who Lived," he could not stay undead for very long. The British crypt scene started to bore him after about two seconds, because no one would pay ay attention to his superior angstiness. All of the other little angsty boys had been slaughtered, as well, and the residents of the underworld were well over their quota.
So, after having his pasty ass royally kicked out of the Vampiric elite, he was brought back to life by some random Voodoo shaman and sent back to Hogwarts to finish his studies and perturb the living like a good little boy.
Little did Harry know, that an uninvited guest wearing a distasteful floral button-down shirt had followed him all the way to the Underworld and back. He stealthily followed him, constantly snapping pictures from the tiny hidden camera, micro-chipped into his head by some dude with a laser. DUN DUN DUN...a runaway poncy possum.