What do you mean, a piece of bread ate itself?

He ate himself for a piece of bread when he was very hungry. It was a cold joke and had no special meaning. A cold joke means that the joke itself is boring, homophonic, translated, or omitting the theme, different logic, judgment or special content, or because of the performer's mood or expression, and it is difficult to make people laugh, but it does not mean that the joke itself is boring, which is also a manifestation of humor.