Metric Time
When I was working waiting tables they changed scheduling systems and the times printed were in military time. My shift said I started at 10:50, so that is when I showed up—10:50 AM.
At the end of my shift, my manager handed me a write up to sign for being late. I refused because I was there at my scheduled time, 10:50 AM. He then tried to tell me I was supposed to be in at 10:30.
This is when I go and grab the paper schedule and point to where it says 10:50, clearly written. At this point, I start to notice that all of the start times were either at the top of an hour—1:00, 13:00, etc—or at the hour and :50.
When making the schedule, he thought that :50 in military time was a half-hour and would not listen to me when I explained, as clearly as I could, that it was the hours that changed, not the minutes.
He still put that write up in my file. Story credit: Reddit / Beezo514