9. "You Weren't Supposed To Get Here" (GTA: III)
One of the first Easter Eggs to have featured in the Grand Theft Auto series is the "You weren't supposed to be able to get here you know" sign in GTA III. Various other versions exist in follow up games such as the PSP Grand Theft Auto: Liberty City Stories, where it reads "Hello again!" and in the PS2 version: "You just can't get enough of this alley, can you?" To find it, head to Staunton Island and head to the car park which was used in the Kingdom Come mission. Steal a car and take it around to an underground car park nearby. Drive the car up to the top of a flight of stairs and get out. Jump onto the car and then onto the roof, then walk across and jump into the nearby alley full of trees to find the sign on a wall.