Oh goody this thread is back again! :3
Here's an awesome one for ya. Most of our tills at RCSS have a sign above the monitor about the 'Deal of the Week', which runs Friday through Thursday. that we have to tell every customer about. One time, I had a guy come through my lane who asked me 'Is today Friday through Thursday?' Worst part was that he was dead serious about it. Thankfully, the customer begin behind him politely explained that 'Friday through Thursday is every day', because I honestly didn't know what to say to that. ._.
I also had some moron sitting on the scale at one of the self checkouts we have. I asked him to get off the scale, to which he replies 'What, am I too fat?' I wanted to tell him he was an idiot for sitting on a scale meant for food.