The Mandela Effect

"Mulder and Scully, and eventually Reggie,
argue over whether these events are an
example of the Mandela Effect, in which
history is seemingly rewritten by collective
acceptance of erroneous facts.
(Reggie refers to it as the Mengele Effect.)"
- "The Lost Art of Forehead Sweat"
The X-Files Episode no. Se. 11 ,Ep. 4