Superman Magnets
Whenever Clark Kent sends a picture to his favorite momma, she slaps it on the family fridge with a Superman magnet (I wonder if she even knows). Adorning the fridge of every Metropolis citizen are pictures of The Man of Steel affixed by the magnetic force of Superman's charismatic magnetism... or just magnetism. When you don't want to forget to pay those pesky bills, grab a Superman magnet and place it somewhere you're likely to see it. I suggest the fridge.