I was called out to a very deaf old lady a few days ago to open her front door.
She was very deaf and could barely understand anything i was saying.
I tried picking form the outside but was finding it difficult so explained (at 200dB) i would try from the inside of the door.
So she toddles off round the back and opens up.
I collect my tools and walk round to find her facing the door looking out the glass.
I tried many times to get her attention, coughing loudly etc so i didnt have to tap her on the shoulder. She was pretty old and i figured she might have a heart attack should i startle her...
She could hear what i was saying but clearly thought i was on the other side of the door still

In the end i gave in, walked all the way round and spoke through the letter box to tell he im coming round lol
Its not nice dealing with vunerable people like this, she needed to be in a home to be honest.