https://www.theregister.co.uk/2019/08/02/ai_pub_system/

Pics and video A British firm thinks it has found the answer to an age-old problem – how to decide which boozed-up revellers should get served at the bar first.

It works like this. A webcam constantly scans the crowd of eager punters wanting to get a drink and sorts them out in the order in which it first spotted them. They are assigned a number, which appears on a large behind-the-bar display hovering over their heads so that people can see when they're going to be served and bar staff can also check the order on iPads.