Writing exercise

For some reason I am under the impression that most people have alter egos, I do, I several. My favorite one is “Shelly” and I really wish I was like her but... Anyway... Take a normal situation, grocery shopping, an hour on a train or similar and write down how your alter ego would act and what he or she would do in situations. What kind of groceries would he/she buy? Will he/she walk there, ride a bike because it’s better for the environment, take the bus or will he/she drive up there in a fabulous red 65 corvette stingray?