What really gets my goat is when people advertise an item for, say, .50¢. Unless you mean that the item is 50/100ths (or 1/2) of a penny, then it is not .50¢
. It is 50¢, or $.50, or $0.50.
I have always wanted to try to pay someone 1 penny and ask for my change when something is advertised as .50¢, but I never have.
Of course, it has always been my life's dream to have a giant red sharpie and go around correcting incorrect grammar on signs.