~20 years ago I was a sales engineer to the extremely good salesman. We had submitted a substantial quote followed by invoice to one of the tier I carriers in US, but for reason or the other, it wouldn't get processed / paid. Rumor has it that the (now retired) VP blocking the payment at carrier in roundabout ways told to our sales exec that he will be going to Toronto at a given date and that he has never spent a night with sisters. Allegedly arrangements were made, and as soon as he was back, that PO was approved.

Till today, I do not know if that's how it expired. The salesman never admitted to anything. And in all ways he was one the most organized and professional salesman I've ever worked with. And in that vain, I want to believe this is how it also happened.