Microsoft Bunny
During the development of Microsoft Windows 95 the shell developers had several stuffed animals as mascots. One was Bear, who was a hold over from Windows 3.1. There were two others, bunnies, as well: the smaller one called "16-bit Bunny" and the larger one called "32-bit Bunny". The naming is connected to the fact that Windows 95 was the transitional OS.
In the case of the 32-bit Bunny, knowledge of it was actually somewhat useful to end users. These features needed to be turned on while Windows 95 was tested and the secret of turning them on was not removed. Some of the desktop features, including full window drag and anti-aliased fonts, could be turned on by placing the line ILOVEBUNNY32=1 under the windows section in win.ini.
Just like the Bear, the Bunny has an exported function named after him, BUNNY_351 in krnl386.exe.
Also, the Bunny is the icon for rumor.exe (Microsoft Party Line) in some Windows Chicago betas.
Read more about this topic: Easter Eggs In Microsoft Products