What's black and sits on the bottom of the stairs to the cellar?
Steven Hawking where the experiments went wrong.
Cellar Hawking
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Explanation
This is a dark joke playing on the physical condition of Stephen Hawking, who used a wheelchair, and imagining him as something that was discarded in a cellar. It's morbid because it uses his disability in a humorous, yet somewhat disrespectful, way.