This would operate in 2 stages:
1. Data collection - As people could go into order they could opt to tell the system what their basic mood is (i.e. Sad, happy, excited, really hungry) and it would collect that data as well as save the order. This would then be compiled from several regions to find out what people eat most when they are in certain moods.
2. Implementation into ordering system - When we have enough data from this, we could implement a method of ordering where you can choose "Let your mood choose your food." This would show you a selection of all the previously or mostly chosen moods and when you choose one, gives you a selection of the two or three most commonly ordered items from that mood.