Oh man, way back when, when I was a Barista, I would love it when I was unable to clock in for one reason or another, usually when I was covering a shift and the system wasn't expecting me clocking in. The clock-in attempt would be denied and the terminal would read "BLOCKED," and require a supervisor's permission. Horrie shets!!, it was at this time, and this time only, that I could report to the Lead, "I'm clock-blocked in the back." (if the back terminal was used to clock in.)