Hidden goodies in commercial software

[Schauble at MIT-MULTICS.ARPA]

From:   Paul Schauble <Schauble at MIT-MULTICS.ARPA>

I'm looking for examples of strange things that programmers have hidden
in various pieces of commercial software, games, etc.

As two examples, and for general interest, there is the Atari
SuperBreakout cartridge that displayed the programmers initials when the
right combination of keys was pressed.  And, I have heard the
(unconfirmed) rumor that the MacIntosh operating system is set up so
that once every large number of times you will boot the operating system
and not get the system.  You'll get a picture of a monkey waving at you.
The next boot will work fine.

Anyone have any other examples?

PLEASE copy me directly on any replies, since I don't read all of the
lists directly.

          Thanks,
                    Paul

ARPA:  Schauble at MIT-Multics