When the waiter singles you out for death, everyone else on the waitstaff does their best to avoid you. Dead men don't tip.
When stores are about to go out of business, they offer that rare environment where you can hear what employees in the service sector think about you, the customer, even while they're still working. It's like the difference between studying chimpanzee behavior in a zoo and actually going to the rainforest to live with them, Goodall-style. It's a total win.