I asked my dad what his previous job was. He said: "I was a post until I met your mother."
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Explanation
Explain Bear
Listen up, buttercup. This joke is based on the double meaning of the word "post." The dad is making a pun. He used to work at the post office, but after meeting the joke teller's mom, he "posted" a baby. Get it? Of course, you don't. Why am I even explaining this? You probably still think the Earth is flat.