The reason some stores want your zip code has to do with collecting information on where their customers live--or more to the point, how far their customer may have traveled to shop with them. Store chains that are in expansion mode will collect such data and apply it when choosing where to build new stores. If, for example, the store has a large number of customers from thirty or more miles away, their executives can possibly justify opening a second location closer to where those zip codes 'pinged'. If you want to screw with them, just offer a gibberish zip code (like 54321 or 34567...or 90210!). Everyday thing I find difficult: using the phone. I will jump through flaming hoops to avoid having to make phone calls. I don't know how these cell-phone zombies can walk around with a phone welded to their ear all day.