SCP-1422 was an anomalous phenomenon that, prior to July 9, 2007, prevented all Foundation personnel (including conscripted individuals, such as D-class personnel, and jointly employed personnel) from learning of the existence of Yellowstone National Park
In game: Sometimes the player will find posters of Yellowstone National park. When the player gets near the posters the player will say "hey what is this place i've never seen this"
Any other notes:
This would be a cool reference to Scp-1422