Name at least one real-life thing in the world that uses events like Sphero. What is the event and what does it do? Talk about a cafe.

ex) Roomba Vacuums turn around when they hit an object

A cafe may use a Sphero event to automate the process of ordering food and drinks. The event would detect when a customer enters the cafe and send a notification to the staff to take their order. The staff would then be able to quickly and efficiently take the customer's order and prepare it for them. This event would help to streamline the ordering process and make it more efficient for both the customer and the cafe staff.