Something that someone posted on the internet isn't true? And the person posted it like it was true and didn't credit it as something they got in a chain email?
I'll give the OP the benefit of the doubt because we are, of course, talking about fast food cashiers.
In high school, I knew this girl that worked at Wal-Mart and she was as dumb as a box of rocks. I went there and after checking out asked her if she could give me six 20's for a 100 dollar bill. Worked like a charm.