I can't remember the details, but sometime in the '70s or '80s a sci-fi magazine ran a context: take a short text (something like "a man gets onto a bus and notices another man wearing an unusual hat") and rewrite it in the distinctive style of a sci-fi writer of your choice.

The winning results were pretty entertaining. I only remember the Heinlein entry having something like "Why, he's using plasteel for his helmet liner instead of ferrocrete!"