Queue Confusion
The thrill of shopping often comes to a halt at the sight of long checkout lines; discovering a short queue feels like striking gold, especially when there are merely two people ahead. Imagine the surprise, however, when those "people" turn out to be dummies.
One can only speculate on the duration it took for this woman to recognize her fellow queue members were not of flesh and blood. Her expression of irritation suggests it might have taken more than just a moment, leading to an amusing yet frustrating realization in what appeared to be the shortest line ever.