When you open a fresh jar of peanut butter do you only work through one side until it is completely empty then start on the other side?
Or when you get those shallow tubs of hummus does it have to make it back home undisturbed? Then one of the baggers at the grocery store shoves it sideways into the bag completely ruining the symmetry.
A colleague of mine cannot allow beans to touch some other foods on their plate. So in an English breakfast for example, they require some kind of bean barrier, such as a sausage, to prevent the beans from touching other elements of food on their plate. I find this weird.