But if you limit your time horizon enough... to minutes, even... aren't impulses rational too? I don't really know, I'm just spouting. I am curious as to an example of an action that you don't think is a rational decision...?

Expressive rationality is like... making a stand, even though it would make more sense for you to cooperate with your higher-ups, because it's part of who you are/showing your principles/self-worth.