Here's an example (and it is N because it is not logical). Your friend's mom recently bought a motorcycle, so it's on your mind. You start noticing all the people that drive motorcycles as a result, which leads you to believe that there is some connection between the appearance of your friend's mom's motorcycle and the increase in motorcyclers that you are witnessing. You then theorize that maybe it's the season that's inspiring people to buy motorcycles, or that there's a motorcycle sale nearby, or that maybe motorcycles are in fashion this year. You don't come to any conclusion, but that's not the point...the point is that you are enamored of the connection that you perceived between the mom's motorcycle and the increase in the number of people riding motorcycles, and you take pleasure in the the speculation that this generates.
The N is the trigger that gives your mind a hunch to follow. It's why you would notice more motorcycles in the first place, because you had a hunch that it was possible that the mom's motorcycle purchase signified a generalizable trend in casual motorcycle buying. Of course it's never that explicit in your head, but it is what gives you the motivation to notice and follow patterns. This can, of course, lead to magical thinking.