Selecting this will cause the selected Sim to go to the closet and knock on it, which will bring Bonehilda out to do chores. If the 'skeleton maid' version of Bonehilda is in her closet, clicking on the closet will give the 'Knock' interaction. This version of Bonehilda is literally a 'skeleton in the closet'. The other can be bought on residential lots as a magical (and much cheaper) equivalent of Servo.
One is the janitor on the Magic Town lots A Spooktacular Spot and Vernon's Vault. There are two versions of Bonehilda in the game. 1.1.2 Things Servo does that Bonehilda doesn't.1.1.1 Things Bonehilda does that Servo doesn't.She is considered to be the first skeleton in The Sims series even though skeletons were not made playable until The Sims 4: Jungle Adventure. Her name may also be a pun on Brunhild/Brunhilda, a powerful figure from Norse and Germanic mythology. The 'Bone' in her name refers to her being a skeleton. Bonehilda is an NPC that was introduced in The Sims: Makin' Magic and later returned in The Sims 3: Supernatural and The Sims 4: Paranormal Stuff.