It's bad enough facing the cashier with my cart full of vodka and fish sticks. Will someone someday realize that I only buy ice cream after midnight? If I buy condoms one month, and a pregnancy test the next, does some kind of red flag get raised?

With these concerns in mind, I've made a habit of these simple steps to help keep my grocery-shopping anonymous: 1) I sign up with an alias and 2) I swap cards regularly with friends.

Now I want to try something different. I want to take the credit for all of my shopping, and for your shopping too!