For quite some time, my pocket schema has consisted of keys, cell phone and pen in my front left pocket, and wallet in my front right pocket. This arrangement has worked for me, but I'm not dogmatic about it; I would delight in a superior method.
Certain inessential routines manage to escape the light of outside corroboration, which is comforting. These "Opaque Habits" would also incude: toilet paper techniques and eggcorns ("for all intents-and-purposes" vs. "for all intensive purposes").
I would like to believe that they act like vestigial organs or viruses. How would we trace their origins? Who is the "patient zero"? And who wears their wallets in their back pockets, anyway?