I am confused about the Dock penny test to see if the dock is bent. I have been seeing videos pop up about the penny test. I know my dock is not bent as I placed it up against something straight and it was pressed up flush with the object. But i am seeing pennies being used at the bottom and slid up to top of gap to test. I was curious and tried myself but I can't even get the penny in the bottom it's way to big. So I am confused. There's no other currency that has a penny right other than British pound right?