What little patterns or habits do you have that maybe make no sense but you do them anyway?
We know Cyndy wipes her shower down after every use.
I have a thing with toilet paper and kind of have to immediately run out to buy more if our stockpile gets down to less than four rolls. You never know!
I always sort the paper money in my wallet so that the portrait heads are up and front-facing, with denominations ordered from small to large.
There's an eating order for cans of deluxe mixed nuts -- pecans first, then Brazils, then cashews, then almonds. Ignore the hazelnuts.