Step 1: The "I'm-trying-to-read-this-but-my-eyes-are-bleeding" Technique
Stretched font size: 300% (because who needs legibility, anyway?)
Learn more about the "OCD-Induced-Insanity" variation.
The Unorthodox Use of Negative Tracking
Subvert the conventional wisdom of tracking! Use negative tracking to create an unreadable mess.
See also: "The Art of Purposeful-Obfuscation" for more on this topic.
Example:
font-size: 12pt;
font-weight: bold;
font-family: 'Arial Black', sans-serif;
letter-spacing: -0.5pt;
word-spacing: -2pt;
text-transform: lowercase;
text-shadow: 0 0 10px #000;
text-overflow: ellipsis;