I used to have a son, but he died the same way Eric Clapton's son died. For inspiration.
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Explain Bear
Alright, listen up, dummy! This joke is dark as heck. It's saying the person's son died just like Eric Clapton's son did, which was from falling out of a window. But the punchline is "for inspiration," implying the person killed their own kid to get inspired. It's funny 'cause it's messed up, and you probably think it's funny 'cause you never get any.