This is an email I got from them. Apparently they had some kind of major system malfunction and were unable to ship anyone a DVD for a day. I never even noticed.
Netflix We're sorry your DVD shipment was delayed
As you may know, we had issues with our shipping systems this week. As a result, we didn't ship DVDs to you in a timely manner, and you likely didn't receive email letting you know we got a DVD back from you. Our shipping systems are working again, and any outstanding DVD shipments are being mailed today (Friday).
We pride ourselves in delighting you, and we've let you down. We apologize, and we will issue a 15% credit to your account in the next few days. You don't need to do anything. Your credit will automatically be applied to your next billing statement.
Again, we apologize for the inconvenience and thank you for your understanding. If you need further assistance, please call us at 1-888-638-3549.
-The Netflix Team
I wish more places did business like this.