Evident from the name, the myth is based off the iconic king of pop, the late Michael Joseph Jackson. Vice City, setup in the 80s, features a handful of easter eggs relating to Michael Jackson, as a tribute to his golden run during the 80s. The cult single, Billie Jean is featured on the Flash FM and plays in Ken Rosenberg's admiral during the mission, In The Beginning..., depicting as to how the song gained popularity in the 80s, particularly in the south. The local drug store in Prawn Island, Elbee Chemists is a reference to the drug store appearing in Billie Jean, shockingly, the song is also setup in Miami. In addition to this, swapping the words Elbee gets Belee, phoentically similar to Billie.
GTA Vice City
Astonishingly, the poster of Boy Scout Zombies appears to be right infront of the drug store, a reference to how Billie Jean and Thriller belong to the same album, as Thriller featured Zombies. Moreover, the industrial road in Prawn Island is similar to the road in Thriller, with a similar background setup and a haunted house located nearby, much identical to the Haunted Mansion. Cementing this reference, is the theatre set located inside the Studios, a theatre also appears in Thriller. Therefore, more or less, the entire scenario of the song, Thriller, fits in Prawn Island.
The street/road in Prawn Island.
The street/road in Thriller.
Haunted Mansion in Prawn Island.
Haunted Mansion in Thriller.
Theatre in Prawn Island.
Theatre in Thriller.
Over the years, mainly due to cult following, players have modded Michael Jackson in the game, formulating a myth, stating that Michael Jackson can be sighted wandering around Vice Point and Prawn Island. Because of these claims being mods most of the time, they are merely just false reports. However, WMYPI, bears a similarity to MJs' dress code in the song Beat it, excluding the head wear and minor textures. This specific pedestrian says "Beat it, just beat it" whenever the player walks around him, there's a plausibility that one might mistake the pedestrian for Michael Jackson.