The phrases “I couldn’t make enough dough” and “kneaded a change” are considered puns because they play on the double meanings of the words "dough" and "kneaded."
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Dough: In the context of baking, "dough" refers to the mixture used to make bread and pastries. However, "dough" is also a slang term for money. Tom's statement implies that he was not making sufficient money while being a baker.
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Kneaded: The word "kneaded" refers to the process of working dough into a desired consistency in baking. At the same time, it sounds like "needed," which pertains to wanting or requiring a change in his career.
These clever wordplays create humor by linking the baking profession with financial issues and the necessity for a career transition, making them a classic example of a pun.