Last year I was at home, I was actually cutting the grass at the time, I get a phone call from Ryan (one of my managers and a friend) asking me if I was ok, I said I was and he said well they were worried about me at work because I hadn't turned up. I said I was working 4 - 8, he said "No, Si, your meant to be doing 11 - 8" I was like wtf, when I checked it said 4 - 8 found out the main manager of the store had changed my hours for that day and not told me. I was well confused, i know I didn't forget but still arg, anyway they wanted me in and they would only pay for the time when I was there I said you pay from 11 - 8 or I won't come in at all, they paid for an 11 - 8 
