Sims 3: Pets Easter Egg - Stone Alive

When you complete the first mystery of the necessity is the mother of invention you will get a new decoration item called "Companion Stone" already most of you have gathered this is a reference to the "Portal" series where you meet "Companion cube" but only difference is that the stone has the "Sims" trademark diamond.

It even has the description that also refers to what "GLADOS" says when you meet "Companion cube" for the first time, which is and i quote "The Stone Companion cannot speak.... in the event that the Stone Companion does speak, please disregard it's advice".

Extra Egg "Demon Gnome"

Have you ever noticed that when you invent the Gnome in the workshop if you place it in your lot it will move from place to place.