Using A Brief Introduction to Unix as input, I picked these scrambled sentences from amidst the scrambled output:
Basically, the idea is that many problems are still typing. By convention, applications invoke the text with an old manuscript claiming it is an example of this. You can get back to your home directory by typing a backslash or sometimes a ^V before it. The backslash also quotes shell meta-characters such as a terminal, printer or disk. Granted, not every program you use should list the environment. On Unix you can look them up in the left margin.
Using input containing phrases more likely to be amusing in the wrong context will produce more amusing results, if you catch my drift.