Had a delivery earlier which I had forgotten was coming. I was sitting doing some work when there was hammering on the front door. Jumped out of my skin then got up and went to the door to see delivery driver smiling at me. I pointed to the door bell and asked him to use that instead of trying to knock my door down. He said he often delivers to old people and they don't hear the doorbell. I pointed out to him that I am not that old (more middle aged) and that the doorbell is there for a reason. Hopefully he has got the message as this is a new monthly delivery but tbh he would have given a heart attack to an old person if he'd hammered on their door like he did mine.
AIBU to wish that people would at least try the bell first and then knock 2nd if they don't get an answer (as it is always possible the bell doesn't work, especially if you can't hear it from outside.