What were Stephen Hawking's last words?
The Windows XP log out sound.
Windows XP
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Explanation
Experiment
Explain Bear
Listen up, buttercup. The joke plays on the fact that Stephen Hawking used a computer to speak. Windows XP is an old computer operating system that made a distinctive sound when it shut down. The joke suggests his last words were that sound as a dark take of his death (he is dead, after all). This is funny because you didn't expect that answer, you big dummy!