Buzzeromatic takes your apartment doorbuzzer and makes it superintelligent. And it doesn't require any new hardware! All you have to do is have your landlord set your buzzer to call Buzzeromatic instead of your mobile or landline phone, and you can instantly start making passcodes for your friends and loved ones to let themselves in with. And then disabling said passcodes when said loved ones go crazy.
Does it get any better? We think not.