I wrote on my other blog about some funny shipment problems I have had in the past year and a half. Three times when I've ordered something and received 2x what I ordered. In all three cases, the companies just told me to keep it.
I had a related yesterday when I wanted to return something to a well-known company and exchange it for another at a different size. In this case, the person on the phone couldn't find my order at all. Did not exist. I had a paper shipping document in front me of and I found the original email from the vendor both of which had the ordered number but it didn't exist in their systems. Perfect.