Turn Your Doorbell Off

My wife and I have recently had a line at the front door of door to door sales people.  A few have had the good luck of ringing the bell while our 11 month old was napping.  This makes us cranky.  While talking this idea over we really were blown away that they don't have these yet.  It would be simple to hook the doorbell up to a switch that you could turn on and off.  That way when the baby goes to sleep you just flip the switch and anyone who hits your door button gets...well nothing.