Its Fake!

I experienced my first fake money today. Some bastard gave me a fake £20 note (which I didn't realise was fake) and so, when depositing the money my store had made at the end of my shift, I had to report it to the company. It happens to everyone (or so I was told) and apparently my note was extremely well made so it would have been difficult to tell it was fake (especially since today was another crazy day with never ending queues of people, therefore making it harder to check notes efficiently). But still i'm annoyed that I got cheated. And now that I know about it I think I know which customer it was. I doubt i'll see him again though.