Easter eggs in gaming

[Shades of Eternity]

while normally associated with video games, there are a number of injokes and stories that are often behind many a gaming product.

for example, how the circle of 8 in greyhawk was a group of pcs from gary's table.

any examples of easter eggs in gaming, and do you do any of your own when your write a product or run a game?

 

[Psion]

Emerald City for Mutants & Materminds is loaded with references to comics, sf, and MST3k.