Yes, it's just another press release gimmick to increase subscriptions for Ancestry.com, but it is kind of fun. They have dug through the U.S. and U.K. census to find a number of ghoulish individuals:

• Ida Witch, a 13-year-old from Illinois, and her mother, Alla Witch, found in the 1920 U.S. census. Mary A. Witch and Edwin Witch, a chemist's apprentice, found in the 1851 England census.
• Frank and Fannie Frankenstein of Los Angeles found in the 1930 U.S. census living just down the street from the Blood family and possibly related to Jacob and Sarah Frankenstein found in the 1851 England census.
• Jacob Monster found in the 1910 U.S. census
• The Vampire family including Jean, Otto, George and Mary Vampire, found in the 1870 U.S. census
• The Devil family from Minneapolis, Minnesota, including William A., Louis, Mary and Anna Devil, found in the 1930 U.S. census
• Emma Ghost of South Dakota found in the 1910 and 1920 U.S. censuses, possibly a distant relative of Mary A. Ghost found in the 1851 England census
• Pumpkin family of California including Mazzie, Joe and Aurie Pumpkin, found in the 1930 U.S. census
• Loyal Blood of Alabama and Memory Blood of Arkansas, apparently no relation, both listed in 1930 census
• The Zombie family of Rhode Island including Anna, Antoinxette and Mary Zombie, found in the 1930 U.S. census
• Brothers John and Clarence Goblin of Charlotte, North Carolina, found in the 1930 U.S. census
• Young Ada Ghoul of Washington, D.C., found in the 1880 U.S. census
• Mary A. Bat and the Bat family both listed in the 1851 England census, apparently no relation.
• John Ashlin Skelton found in the 1851 England census.

Ancestry.com also found some interesting occupations, ranging from professional wizards to grave diggers and yes, even a woman identified as a hag:

Professional Wizards: Harbidge Seaman from 1880 U.S. census and Henry Norman, Louis Harty Fowler and Gustave Reticke from the 1881 England census

The Queen's Magician and Wizard of the Wicked World: John Holden from the 1881 England census

Witch: Ellen Hannan from 1880 U.S. census

Witch doctor: Lafayette Springs from 1880 U.S. census

Hag: Lizzie Isom from 1880 U.S. census

Undertakers: Columbus A. Marble and Robert Hole from 1880 U.S. census and Gains A. Stone from the 1881 England census

Grave diggers: George Holloman and Frederick Skelton from the 1881 England census and Gregory Pitts from 1880 U.S. census

Fortune tellers: Mayes Family from 1880 U.S. census and Rebecca Smith from the 1881 England census

Gypsy fortune tellers: Gertrude Hazelgrove from the 1881 England census

Circus clowns: Robb Hunting and Jasper N. Rentfrow from 1880 U.S. census

Musical clowns: Henry Frank and Henry Wm. Garto from the 1881 England census

Jesters: Robert Burton, Henry Crowhurst and Edmund Curtis Owen from the 1881 England census and Augustus B. Osgood from 1880 U.S. census

Magicians: Levi Pike, Louis Morgenstern and Jim Goose from 1880 U.S. census

Candy man: Frank G. Grimley from 1880 U.S. census

Candy shop confectioner: Ann Jackson from the 1881 England census

While interesting, this press release also shows some of the difficulties presented in reading and interpreting old census records. Alla Witch, for example, is not really Alla Witch...

Ancestry.com includes the complete U.S. census and U.K. census in its subscription offerings.

Related:
Researching Ancestors in the U.S. Census
Researching Ancestors in the British Census
Top 10 Search Tips for Census Success