Microsoft Word (Windows and MAC)

Word for Windows v1.1

Source: Todd Lutz

Here is a hidden feature of Word for Windows:

1. Turn CAPS LOCK on.
2. Choose Format, Define Styles, Options.
3. In the Based On field, select Normal.
4. You will get an error message, select OK.
5. Select Cancel.
6. Select Help, About.
7. Make sure your mouse cursor is inside the help box, then press the
   following four keys all at the same time: OPUS

You should get some fireworks with the authors names scrolling on the screen.

Word for Windows v2.0

Source: (nancy b.)

To see some cute animation, a not-so-subtle jab at WordPerfect, and a list of those responsible for "wizardry", "quality",
etc... on the Word for Windows 2.0 project:

Start WfW 2.0.
In the Tools menu, click on Macro.
For the Macro Name, type spiff
Click on Edit.
Delete the lines Sub MAIN and End Sub
In the File menu, choose Close.
You will be asked if you want to save the changes. Click on Yes.
In the Help menu, click on About.
Click on the Word icon in the upper left, and enjoy ;-).

If you have high resolution drivers, you might not see that awful green WordPerfect monster or the little people jumping up and down in glee after they make it go away. If all you see is the fireworks with the credits rolling in the foreground, then this is the case. Change to a lower resolution (800x600 or 640x480) driver to see the first part also.

Word 4.0 for Apple Mac

Source: Louis Koziarz 

Call up the "About Word..." dialog box
Press and hold the command key
Click on the flying W logo

Microsoft Word 3.01 and 4.x
Contributed by Adam Shostack

Spellcheck the word "childcare".
The spell-checker will suggest one word: "kidnaper" (sic).
 

Microsoft Word 4.0
 

Select "About Microsoft Word" and command-click on the Word icon.

The resulting dialog gives the names of beta-testers.