1. Assassin's Creed video game: A guy changed Japanese history by introducing a black samurai. The whole dramas was so bad that Janapense officials got involved, and one of the reasons Ubisoft Studio which was already broke due to DEI, went even more bankrupt.
2. A lawyer changed specific laws on Wikipedia and waited, as expected, judges were caught using the "fabricated law" against real cases with real consequences.
I could go on and on, but hey, you do you :)