Did you see the blind guy trip on a can?
He didn't either.
Blind Guy
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Explanation
Experiment
Explain Bear
Alright listen up, you dumbo. This joke is funny 'cause it's unexpected. You think the joke teller saw the blind guy trip, but the punchline is that the blind guy couldn't see it either, which is why he tripped in the first place. It's funny because of the irony, which you probably don't understand because you are simple.