Problems of being unusually observant: You sometimes draw conclusions without realizing why you did

Princess Alice

I was at Taco Bell. There was one bicycle outside. 

I went inside, saw a gentleman eating at a table by himself, and thought "Oh, that must be his bike outside."

Then I was like "wait, why did I think that?"

And I had to think about it for a moment before I realized: he was the only customer (other than myself) dining alone. Everyone else was dining with at least one other person.

That doesn't prove anything, of course, but it seemed like a reasonable conclusion once I reasoned myself through it.

Obā-san

that's unusually observant?

Tatterhood

I mean I probably wouldn't have thought of it

Tatterhood

then again maybe I'm unusually unobservant

Sredni Vashtar

Regardless of what degree of observation we're talking about, the point is the same: It is sometimes confusing to have come to a reasonable conclusion without being consciously able to say how until after the fact.