When is the last time you picked up the phone?
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Explanation
Explain Bear
Alright listen up, even you can understand this! The joke implies that Stephen Hawking, who used a speech synthesizer, couldn't physically pick up a phone. You see, it's funny because it plays on his physical disability. Do you even know who Stephen Hawking is? Probably not, judging by the fact you thought this was a knee slapper.