I didn't even know the word obscurantism existed!
But to get to the point I have many silly obscurantism in my day to day life, some of which are not so positive.
I'd like to share one I had as a teenager which is pretty weird. I used to look out of the bus window everyday as I went to school for cars that I had deemed "special". For example I had assigned the special quality to a Ford Falcon XR6 "Turbo" and a Mazda 6 station wagon if I remember correctly. When I saw these cars I would think my day would be good compared to when I didn't see them. The unfortunate thing was that sometimes I would sulk that I didn't see that car on a particular day when I needed it to be good and of course would be very happy when I did indeed see one as I knew it would be a good day.
I would deny the sighting if it was indeed a bad day and had actually seen a "special' car. My idea had to be true and nothing was going to let it be untrue.
Thank you for the giveaway and I hope more obscurantisms are born where there is a giveaway involved :B