Rei freaks out when Usagi told her that she saw Michael. Usagi was actually referring to Michael Jackson*.
This clip is from Bishoujo Senshi Sailormoon S, episode 133.
*Note: This was an inside joke to Rei's voice actor, Michie Tomizawa, who is a big fan of the King of Pop.
Also check out "Fire Soul Love", one of Rei's image songs that sounds like a mashup of Janet Jackson's "Rhythm Nation" and Michael Jackson's "Remember The Time".
![](https://i.ytimg.com/vi/ZzU-eqZejcA/mqdefault.jpg)