Just had 4th delivery of the day.
Every single delivery had the "special instruction" RING THE BELL printed on the label.
Every single driver tapped the door.
"Never underestimate the predictability of stupidity".
In the Lurking household, if I am not in, and MrsLH is in the back of the house, a knock won't be heard (but the secondary doorbell ringer will).
In the few days over Xmas, I may knock up a detection rig that rings the bell if anyone stands by the door for more than 5 seconds (one project for my Raspberry Pi).
What's the point ?