So an elderly woman thinks her husband is starting to go deaf...
The woman decides to test her theory. She stands about 30 feet way and calls to her husband:
"Oh Harry!"
She gets no response. She then stands 20 feet away and calls out to him again:
"Oh Harry!"
She is surprised that he STILL doesn't hear her call so she tries again, this time from 10 feet away:
"Oh Harry!"
Harry exclaims: "For the 3rd time Bertha! What do you want!?"