Part 1: Never start two separate stacks of coupons you plan to use at the store. You will inevitably forget to take one stack with you and miss out on the free cans of chili you use in the dip your family loves so much.

Part 2: Never shop on the last day of the sale, especially at night. This does not give you enough time to send said coupons with your dear husband to collect the free chili.