I think I've tripped over a line between this good question and this bad question. And I'm wondering what is the lesson here?
The word "favorite" is a dead buzzkill. Pragmatic (but vague) adjectives are: useful, interesting, rare, um, useful?
What are the precise boundaries (a posteriori) in this territory?
Bonus question. Am I making too much fuss over this? We're all still friends, right?