Retail return windows are a handy bit of insurance in case you decide you don't want something you bought. However, when you're at the checkout counter, it's probably better if you pretend you can't return it.
There are plenty of stores out there with great return policies. Some are so good you can basically rent stuff from their stores. If you're not careful, however, those lenient return polices can actually trick your brain into holding onto items you don't actually want.
Stores don't like it when you buy things that you plan to return, but let's be honest: most of us have at least considered it once or twice. If you're going to game the returns system, do it right. Here's how.