Here's one that always has me stare at the screen, quietly, in disbelief.

1. Carefully read and grok a small-to-medium sized module. 2. Notice that although the style is not the "official" style of that language, that it is very consistent and legible. 3. Contribute a small change in that exact same style, such that no one would know that it was a different author if they did not look at the git blame. 4. Get a condescending comment from the first author asking that you, "read and follow the official BLANK style guide".