Indeed. Like I mentioned briefly in my footnote, I understand that this is not an approach that you can apply that generally, in any situation. Particularly if you actually somehow depend on other people's impressedness for something that matters to you, actively putting effort into impressing them (if done right) will probably get you more reliable results. If you really need people to think you're amazing, I guess my approach would be a pretty big gamble. The whole point of being subtle is to accept the risk that people won't notice, which works well for art but not for traffic signs.

That's not really my purpose with this, though. The purpose of this idea is mainly to liberate yourself from the urge to impress people at all. Again, you can't always afford to do that -- we all know a job interview is not the moment for modesty -- so the scope would have to be limited to those situations where looking clever really isn't all that important, but I think that still covers a sizeable proportion of them. Including, very much, writing comments on LessWrong that may or may not contain the word 'obviously'.