Clap-board from Thriller

Effects
Michael Jackson's Thriller is an American 13-minute music video for the song of the same name released on December 2, 1983. It was directed by John Landis, who also co-wrote the screenplay with Michael Jackson.

It was MTV's first world premiere video. Voted as the most influential pop music video of all time, Thriller proved to have a profound effect on popular culture, and was named "a watershed moment for the [music] industry" for its unprecedented merging of filmmaking and music. Guinness World Records listed it in 2006 as the "most successful music video", selling over nine million copies. In 2009, the video was inducted into the National Film Registry by the Library of Congress, the first music video to ever receive this honor, for being “culturally, historically or aesthetically” significant.

This directors clap-board was used by Landis during filming and took on the dramatic and theatrical nature of the film.

Effects
When the name of a song is written on the board and it is clapped, the user and anyone nearby will be transported into a pocket dimension featuring the music video for the song. If no music video exists then they will instead be sent to a black space. While there, the users will be able to interact with any actors, set pieces or animations as if they were real, and the world will change accordingly. The artifact can be used multiple times in succession, jumping from one video to the next.

The scene resets each time, meaning any changes made to a scene have no real impact, though any dangers present in the video may become very life-threatening. Because of this, it his high ill-advised to use the artifact to visit it's video of origin. The second reason is that there is no way to escape the pocket dimension until the song plays out, and at 13+ minutes Thriller is a very long wait.