Shovelhead

In 1st and 2nd edition Vampire: The Masquerade, Sabbat vampires were created through an initiation ceremony. Sabbat initiates were embraced by their sire, then knocked unconscious, thrown in an open grave, and then buried. The whelp then had to dig his way out of the grave, during which time thanks to the Embrace's mystical properties, he would be dogged with bizarre hallucinatory visions. When (if) the whelp emerged, he was stripped completely of his humanity and ready for induction into the Sabbat.

The Revised edition Sabbat do not do this; while shovelheading is still a technique occasionally used (particularly for War Parties), most of the Sabbat clans are a bit more choosy about who they embrace. Instead, True Sabbat still go through a rite of indoctrination, but it isn't necessarily the shovelhead approach.