Right now, Canada has ditched the penny.
It is no doubt causing a lot of grief with customers that seem likely to whine making a fuss. Miss that was supposed to come out to 2.25, not 2.30 as if the extra nickel is life or death.
Or cases where they are still just using the old price such as 2.26 and expecting anyone to still be in a hurry to keep pennies handy.
The real trick though is if you pay with plastic, you are paying the extra regardless, so if it costs 2.27 you are paying 2.27, not 2.25.
When I go to Tim Horton's my hot chocolate is 2.26, but fortunately I have a can full of pennies here. I will likely have pennies long after the price in time morphs into something else.
But it does illustrate how cashiers just seem to blindly do what the machine tells them. Yesterday I needed some shortbread bowls, they were listed as 1.99 on the item, and the girl stated 1.79 for reasons I can't fathom and handed me 75 cents back from a toonie. I have no idea what she was doing. The machine would have scanned the item, so I can't say why it was labeled 1.99, it was not on sale to my knowledge. I walked away thinking 'whatever' I am not really feeling like slowing down the line right now.
When the power goes off though, boy that sure is a lot of fun. No one can get gas, so it mangles the work force. You can't buy groceries because they can't process the sale because food can't be input into the machine, because often they have no price on the item. And forget produce being weighed

No lights mean you better live where the windows point in the right direction. And hopefully the weather is neither really hot or really cold. That and with luck you have food in the house that doesn't need to be cooked.
Right now though, I would just hate to have the supply of disposable razors run out. I do have an old fashioned straight safety razor. Not sure why they are called 'safety' razors though hehe. Ever used one?