Far Cry 4: Set in Himalayas with Ridable Elephants, Coming Early 2015
In Far Cry 4, there is an easter egg where if you wait for 13 minutes after the opening cutscene, you beat the game. This is hinted at in the opening cutscene
Easter Eggs - Far Cry Primal Guide - IGN
Far Cry 5: 11 Fascinating Easter Eggs And Secrets - GameSpot