Zip Code Annoyance

It seems everywhere I go these days the stores and restaurants pester you for your zip code.  Granted it is better than hitting you up for your phone number like they did the past few years.  But I decided today to start running a test.  I am going to give out 55544 instead of just declining.  That it an invalid zip code.  Let’s see how many places do real input validation on what the person enters into their system.