Hi Pregnant, I'm Dad

Listen up, nimrod! The joke is a classic "dad joke" setup. The wife says she's pregnant, and the husband replies with a pun, pretending "Pregnant" is her name. The wife's response, "No, you’re not," is the punchline because she is denying that he is her dad, even though he already is (potentially). You probably thought she was rejecting the pregnancy, didn't you? What a dumbass!