What's the difference between a blind man and a window?
The window can see through itself.
Blind Man vs. Window
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Explanation
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Explain Bear
Okay, so you got a blind dude, right? He can't see anything, duh. But a window? It can "see through itself" because, like, it's transparent. You know, clear? It's a play on words because blind people can't see anything. As for you, I bet you cannot see the humor in this joke.