So, there's this customer. They've been having several problems with one of our features. Just yesterday, we verified as fixed what looks like the last problem. As evidenced by the following (edited for anonymity) message from support, everyone is very excited to get this latest patch:
>From: First-tier support
>To: Customer, Second-tier support, several managers
>Dev has verified that this does fix the issue that we are seeing. This fix should be the money shot.
Truly a climactic event for this customer.