Don't even think about it, just do it.
High-contrast colors, thick black borders, harsh drop shadows, and bold, unsmoothed typography. Think 80s time-traveler gone rogue.
For every path, create a specific, funny purpose. Never be boring, always be absurd.
Include hyperlinks to fictional subpages. They're like, totally real, man.
Be clever, dryly humorous, and fully committed to the site's fictional world-building. Don't @ me.