This is the theme custom-written by MC Hammer (real name: Stanley Kirk Burrell) for the launch of the 1990s run of the Addams' Family film series, which introduced a whole new generation of fans to the Addams Family franchise. MC Hammer was still on the rise, and having a rap artist do the theme song added a contemporary feel to the movie, which was based on a '60s TV series about a very creepy family.
The music video is a wildly creative production, starting with Wednesday and Pugsley about to have Hammer's pumpkin in a basket with their guillotine, then Hammer seeking refuge in an iron maiden (by the way, check the history - such a devise was never actually used), Hammer spinning on a torture wheel, Hammer's head on a platter at the dinner table, Hammer dancing in a trench in the graveyard, sword-fighting with the cast, hi-fiving Thing (the disembodied hand), and mixing a sample from "2 Legit 2 Quit." So, like, he really got into the show.
Awesome history lesson: The original TV series The Addams Family was virtually buried behind its far-inferior competing show The Munsters during its original 1964-1966 run, but the cult following has since brought the Addams far ahead of the Munsters. What everybody forgets is that the whole universe is drawn from the single-panel cartoons of one Charles Addams (1912-1988), who published these cartoons in The New Yorker throughout the 1930s and '40s. As is the story with Matt Groening's Simpson's franchise, the Addams weren't even the main characters Charles Addams used - they were just drawn from the comics by a kind of willy-nilly sampling for inspiration.
If you've read this far, you should probably seek out the original Charles Addams' cartoons, published in two collections Drawn and Quartered (1942) and Monster Rally (1950). Addams had a unique vision that has never been matched. His humor was drop-dead dark, macabre, grotesque, and characteristic of Goth culture decades before there ever were Goths. His cartoons were also highly intellectual - you often have to work quite hard, searching every corner of a drawing to spot the joke, and then when you do, it leaps out at you like a nightmare. Frequently the situation depicted is a simple, small moment which leads you to extrapolate what's going to happen next, what just happened, or what's happening out of frame, and that next thought is the horrifying part.