Common Knowledge: Usagi briefly imagines a couple kissing in silhouette. Many fans over the years assumed it was supposed to be Michiru and Haruka. It's actually meant to be Usagi imagining herself and Mamoru as Adam and Eve. If you look closely, you can see "Eve's" tell-tale odango. For what it's worth, "Adam" also has a male chest.
Memetic Mutation: "Brad, the cutest guy in school"ExplanationThe Cloverway Dub had Michelle explaining that she had her First Kiss with a boy named Brad. Fans have referenced Brad to ironically play along with the enforced heteronormativity of Michelle/Neptune's character and often joke about how she dumped him for Amara/Uranus.