It takes effort to evaluate examples. Revealing that one example is bad raises the possibility that others are bad as well, because the methods for choosing examples are correlated with the examples chosen. The two obvious reasons for a bad example are:
The Open Thread posted at the beginning of the month has gotten really, really big, so I've gone ahead and made another one. Post your new discussions here!
This thread is for the discussion of Less Wrong topics that have not appeared in recent posts. If a discussion gets unwieldy, celebrate by turning it into a top-level post.