Bob: My car doesn't have a speedometer.
Rob: Then how do you know how fast you're going?
Bob: Well, when I'm driving at 15 miles an hour, the fenders rattle; at 25 miles an hour, the windows rattle; and at 30, the motor starts knocking-and that's as fast as it'll go.
[英语幽默]The Looney Bin (疯人院)
Late one night at the insane asylum (疯人院）one inmate shouted, "I am Napoleon!"
Another one said, "How do you know?"
The first inmate said, "God told me!"
Just then, a voice from another room shouted, "I did not!"
来源：http://www.cojoke.com/joke/english/How_do_you_know_that/
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