The manager was cheerful about it, and told me I wasn't the first person to bring back that particular item. Then he reeled me in:
"I'll gladly get you a refund; did you have any other shopping to do today? I can have the checker credit your order."
"Oh... I suppose I do."
I returned an item that cost less than $2, and then ended up buying a week's worth of groceries at $50.
Zappos may be the only other company I can think of that has the kind of return policy that increases revenue in the long run.