Copied from my Easter Egg thread:
Many people think the secret room in Atari’s Adventure that displays programmer Warren Robinett’s name is the very first video game Easter egg.
That’s not true, though. The very first Easter egg is in fact found in the 1973 game Moonlander.
If the player landed at exactly the right spot, a McDonalds appeared. The astronaut would leave the lander and walk over to the McDonalds and order a Big Mac to go, before walking back to the Lander and taking off again. If players crashed directly into the McDonalds, the game displayed a message reading ‘You clod. You’ve destroyed the only McDonald’s on the Moon.’
