In some ways, we did. 0 hour contracts have been on the rise for a while [0] and these can result in drastically varied shifts. One day you could be working for seven hours, another for only four. You could be set to work from 9-5 and get sent home at 3 because you weren't needed. It probably happens more than most expect...

[0] https://www.statista.com/statistics/414896/employees-with-ze...