When your grandkids bring you the change they find on the floor or ground or in furniture regardless of where you are. My wife thinks it funny because my two youngest neither of which can talk yet will gather up all the loose coins they find and even if someone gives them coins for their piggy banks and bring them straight to PawPaw. Plus this keeps me from bending over to pick up change I drop lol
You know you're a coin collector when you literally droll on the bank counter when the teller brings out some silver kennedys.
When you go out to eat and the teller takes two cents from the penny tray so she can give you a dime instead of a nickel and three pennies. And it makes you mad.