The Shoe that Didn't Bang

There is this story that needs to be retold, for it leads to somewhere important, perhaps.

Due to financial constraints, a man lets out the first floor of his wooden house to an alcoholic. Every night the alcoholic would come in late, and just before he dozed off, would throw his shoes, one after the other, creating  two bangs every night. This disturbed the owner no end. One day he musters the courage to tell the alcoholic to stop the bangs. That night, the alcoholic returns late and unaware of the promise he had made, he removes his right shoe and bangs it on to the wall. He then realizes that he had made a promise to the landlord not to bang the shoes. He stops and doesn't throw  the other shoe. On the floor below, the landlord waits for the second bang, but none comes. He checks with the tenant, only to find him worried. The landlord was worried as to why the second bang didn't come through.
The expected did not happen, and that worried the landlord.