As today I was biting into a tasty おにぎり (onigiri: a Japanese riceball snack), I realized as I got to the tuna filling that I couldn't stand to have the filling facing downward.
Background for those not in the know: onigiri come in a zillion varieties, with the most popular sold at convenience stores tending to have a filling of some sort (fish eggs, tuna, salmon, pickled seaweed...). Though the filling is in the center, it tends to be near the top or the bottom. Imagine the "top" or "bottom" of pizza or something.
Anyway, I figured that it made no sense to have the filling on the top, because there are more taste buds at the bottom half of my mouth. I flipped the onigiri over, and it just felt wrong. Where did this irrational feeling come from? I suppose from a lifetime of eating toast with spread on top?
Regardless, the snack was finished without further incident.