blind skydiver

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Bob, an experienced sky diver, was getting ready for a jump one day
when he spotted another man outfitted to dive wearing dark glasses,
carrying a white cane and holding a seeing-eye dog by a leash. Shocked
that the blind man was also going to jump, Bob struck up a
conversation, expressing his admiration for the man's courage. Then,
curious, he asked, "How do you know when the ground is getting close?"

"Easy," replied the blind man. "The leash goes slack."