[CloudNetworking]

It was. Microsoft used to have some... uhm... overengineered easter eggs.

It's probably not common anymore due to trust and legal reasons.

[duiker101]

There's a wiki page for them[1]. With one of the most famous probably being The Hall of Tortured Souls[2].

[1] https://en.wikipedia.org/wiki/List_of_Easter_eggs_in_Microso...

[2] http://eeggs.com/items/719.html