It's okay to tell a Stephen Hawking joke if there are stairs in your house he can't get to you. Plus, he shut himself down, so it's all good :)
Hawking's Stairs
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Explanation
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Explain Bear
Alright, listen up, nimrod. The "joke" is that Stephen Hawking was in a wheelchair and couldn't climb stairs, so you're safe from his theoretical physicist wrath if you tell a joke about him in a house with stairs. Also, the person thinks Hawking "shut himself down", meaning he died, which is "all good." You probably think the mitochondria is the powerhouse of the cell, don't you?