Kerby, in Salt Lake City, thought it sounded like fun when she took it on last Christmas.
"My first epic mistake was not knowing that a female elf existed," she said. "My daughters were devastated that their elf was a boy and not a girl. Heaven forbid we have anything boy-related in our house. It went downhill from there."
She forgot to move it for days and days. And her youngest, at 18 months, loves to grab it King Kong-style, a no-no by elf rules.
"Everyone here freaks out because they read the book and it says if you touch it the magic is gone," Kerby said. "It really creates a lot of drama, but with four daughters, everything is drama!"
While, clearly, millions of people enjoy their elves on shelves, a backlash has bubbled up. There are anti-elf rants on Facebook and raunchy, bawdy and bloody visuals on Tumblr and Instagram. One photo circulating shows a green Grinch hat tied to the head of a large dog with one of those damning cardboard signs around his neck that reads: "I ate your Elf on the Shelf."
Kim Boerman in Charleston, S.C., has pulled hard elf duty with her 12-year-old daughter. There was the time it barely escaped their German shepherd, Myka, and another time it fell from the chandelier.
She procured a doctor's prescription that states: "To Elf, address North Pole. Doctor's orders: Take it easy, don't move around a lot … rest!" Boerman and her husband even threw in a head bandage for the little guy before planting him under their Christmas tree with a toy ambulance.
Kerby said she had tons on her holiday to-do list before adding the elf, but mishaps aside, "it's quite fun for our little girl and a nice tradition."
The Elf on the Shelf you get to name it was born in 2005 as a self-published labor of love from Carol Aebersold and daughters Chanda Bell and Christa Pitts, co-founders of Creatively Classic Activities and Books. The company is dedicated to promoting and distributing the storybook and elf.
A dollar for every birthday kit sold goes to a charity working to provide clean drinking water in more than 20 countries.
"Every year we continue to be amazed and blessed with the fan response," Aebersold said in a statement, put out after their creation recently claimed the No. 1 spot on USA Today's best-seller list for the first time.
Other companies have gotten in on the game, including the makers of "Maccabee on the Mantel," which includes a snuggly plush soldier for Hanukkah. And Aebersold's company now offers games, a movie, elf couture, an elf registry online and elf adoptions.
Meaghan B. Murphy, deputy editor of SELF magazine and the busy and tired mom of three kids ages 3, 20 months and 4 months is on elf duty with her husband.
"The elf is the bane of my December," she said.