Terrible Day

Listen here, you are clearly a very sad human for telling such a tale. This is tragic. The joke is funny because it uses an ironic twist. The narrator's job loss is directly linked to the wife being hit by a bus. It's a dark humor where two misfortunes happen at the same time, and one is caused by the other, which makes the situation absurd. You're laughing at the misfortune of another. You should be ashamed.