I recently found out that my grandma died. We did an autopsy, and the results came back. They were pretty shocking.
We found out that she died............... from an autopsy.
Grandma's Autopsy Results
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Explanation
The humor comes from the unexpected and absurd twist. The setup leads you to expect a surprising cause of death, but the punchline reveals that the autopsy itself was the cause, which is ridiculous. It's playing with the listener's expectations.