What's the difference between Stephen Hawking and a walkie talkie? Stephen can't walkie and Stephen can't talkie.
Stephen Hawking vs Walkie Talkie
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This is a pun using Stephen Hawking's physical limitations. The words 'walkie' and 'talkie' are part of the term 'walkie-talkie' and the humor comes from applying them to Hawking who could neither walk nor talk without assistance.
MoScottVlogs
Thats gold