It has worked for me. People are impressed when I point out their own sentence structure, things like how many phonemes are in the word "she", etc. I don't know if this also helps signal intelligence, but I also rarely get confused by things people say. Instead of saying, "What?" I say "Oh, I get it. You're trying to say X even though you actually said Y."
Also, I guess it seems like a subject only smart people are interested in. And not even most of them. Guess I got lucky in that regard.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
(I plan to make these threads from now on. Downvote if you disapprove. If I miss one, feel free to do it yourself.)