this may be in the thread already, but a friend of my sister in law brought this up, i wasn't sure if she was serious that she believed it or not.
"The
Avril Lavigne replacement conspiracy theory is a conspiracy theory stating that Canadian singer
Avril Lavigne died in 2003, shortly after the release of her successful first album,
Let Go, and was replaced by a body double named Melissa Vandella"
https://en.m.wikipedia.org/wiki/Avril_Lavigne_replacement_conspiracy_theory