The Subsitute

There was a couple. One day the husband went to work, as usual. All of a sudden a man in a truck appeared at the front door. The husband, frightened, hid behind a tree. The man exchanged a few words with the wife and left. The husband decided to get rid of that man once and for all.
The next day, the husband went to work. But this time, he carried a shotgun with him. The man in the truck came again, the husband shot the man. Then the wife came out and cried,” You idiot! That man was filling in for my boyfriend!”