You run home to look online for an item that you simply *must* have, and find that there is an online ordering confirmation for the item already in your email inbox.
Oops!

But I really did need them for winter, and they were on sale and I had a great coupon. (brown skinny cords, in case you're wondering- to tuck into my engineer boots on really cold days at the park. They were marked down to $19.99 and I had a $10 off code)