When Fedex loses the box in which you shipped all your clothes from San Diego to Boston for the year, and you have to substitute several years' worth of careful curating and collection with the current clearance rack at Gap.
UPDATE: After talking on the phone with probably every employee of Fedex over a period of five days, the box has been located somewhere completely random and is being re-sent to me. This demonstrates the importance of having personal connections in the lost package world. Fortunately, I only purchased two duplicate items so far on final sale; the rest of my compensatory online shopping can go back whence it came. (But maybe I'll keep one skirt as, you know, a memento of this trial of patience, or a duly deserved reward for my suffering...)