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Someone crashed into me but I wonder how you derived the speed? You seem to have a rare and incredible skill there!

Actually I had seen one of my friends having an accident driving more than 100MPH, but luckily they were safe getting some scratches.
As we all know speed thrills but kills.

If somebody decides to put his own life at risk to get some 'thrill' as compensation that's his own decision. However, if he threatens other persons as well who didn't wish to have any 'thrill', then he acts just irresponsibly and criminally.