History Lesson: The Original Video Game Easter Egg

We know that most of you are probably familiar with this piece of Atari mythos, but we thought it would be a festive way to celebrate this Easter Sunday. While Robinett's egotistical stunt was definitely ballsy, it doesn't approach some of our favorite secrets throughout gaming history -- like the legendary Secret Cow Level in Diablo II, or the bitchin' audio file hidden on the Symphony of the Night disc. We're curious to know -- what easter egg, hidden in the folds of one of your favorite video games, especially tickled your fancy?

[Thanks, Matthew.]