Usually on weekends, I find myself visiting Korean McDelivery site to order burgers and stuff. The other day I happened to notice time-limitation sales technique widely used by TV home shopping channels has been implemented in McDonald's home-delivery website.
Positive: display remaining time for selected order to psychologically influence users to convert from website visitors to purchasers
Positive: "kind" reminder message to nudge users for purchase
Positive: as a "punishment" failed to click order button, users need to start all over again. What a great incentive system!
Positive: even a utility app which comes with free coffee promotion displays timer-limitation; this system truly works because the system incentivized me to visit the restaurant this morning!