If you were ever annoyed by some poorly parked car but didn't know how to express the anger - this is the gift for you. It is your civil duty to order these business cards and let know people that they really suck at parking! And, who knows, maybe some of them actually feel shame and learn how to park properly.
Always checking your bag before you go somewhere? No need for that anymore. Just go outside and look down, your doormat will remind you what you need. Feels good to have someone to think for you!