An easter egg is hidden/undocumented feature that is included as a joke or a bonus. So does odoo have any such undocumented features?
Since version 6.1 odoo has had a secret "kitten" mode. What does it do and how is it invoked?
Kitten mode places a cute kitten picture as the background of odoo and invokes a kitten purring sound when you receive an im chat message.
To enter kitten mode you simply include the word kitten in the url string of odoo such as:
The kitten image file and audio file are stored on your web server in version 8 with the installation of the web and im_chat modules and are invoked via a css rule. However since version 6.1 each release of odoo has had slightly different features / images available.
The kitten image originally came form the following website: http://placekitten.com
Example image of the easter egg: