It’s easy: just type =rand() into a Microsoft Word document and press Enter. It’ll be replaced with a five-sentance paragraph:

The quick brown fox jumps over the lazy dog. The quick brown fox jumps over the lazy dog. The quick brown fox jumps over the lazy dog. The quick brown fox jumps over the lazy dog. The quick brown fox jumps over the lazy dog.

You can also type in =rand(3) to get three five-sentance paragraphs.

I figured out that the highest you can go is =rand(200), which produces 14 pages of random goodness. (Assuming you have 12-point Times New Roman font.) Typing =rand(201) and then pressing Enter doesn’t do anything.

So, what’s the practical use of this?

Well, say you want to test some text formatting or text wrapping. Instead of pounding on the keyboard for three minutes producing gobbeldy-gook text to test on, just use Word’s random text insertion.