Operating System Easter Eggs

Amiga (3)
Android 2.3 (1)
Arch Linux (1)
Ark Linux (1)
Atari Portfolio OS (1)
BBC Micro OS (all versions?) (1)
BeOS (6)
Citrix MetaFrame (3)
Commodore 128 (1)
Commodore 264 Series (1)
Commodore Pet (1)
Control Data NOS/VE (1)
Data General AOS/VS (1)
Data General AOS/VS II (1)
Debian GNU/Linux (3)
DEC RSTS (1)
DEC RT11 (1)
Freedom OS (1)
GameCube (4)
Gentoo (3)
HP 2100 computers (Old - 1970's) (1)
HP-UX (2)
iOS 5 (1)
Irix (4)
Kyte Aura (1)
Linux (18)
Mac OS 7.5 (26)
Mac OS 8 (6)
Mac OS 8.5 (5)
Mac OS 8.6 (3)
Mac OS 9 (8)
Mac OS X (30)
Mac OS X Server (1)
Mac SE (1)
Microsoft 8k BASIC (Altair) (1)
Microsoft ROM Basic (Commodore, Ohio Scientific) (1)
MS-DOS (3)
MVS (1)
New Xbox Experience (Xbox 360 Dashboard) (1)
NextStep (1)
Nintendo DS (1)
Nokia (2)
Novell NetWare (1)
OS-2 (3)
OS-9 (also OS-9000) (1)
Palm OS (10)
Pyramid OSx (1)
QNX4 (2)
RiscOS (5)
SunOS/Solaris (2)
Ubuntu (5)
VMS (VAX / Alpha) (2)
Windows 2000 (7)
Windows 3.1 (6)
Windows 7 (1)
Windows 95 (9)
Windows 98 (9)
Windows CE (6)
Windows ME (3)
Windows NT (9)
Windows XP (16)
Windows XP Home Edition (1)