"I don't know if you've ever had a cramp," the six-time NASCAR Sprint Cup Series champion said, "but try dialing a phone like that." Plenty of people on Twitter were taking shots Thursday night at LeBron James, the basketball superstar who had to be carried off the court after suffering from dehydration cramps during the opening game of the NBA's championship series. Although NASCAR drivers routinely deal with much hotter conditions inside their cars, you won't find Johnson knocking James for a condition many non-athletes have never faced and often don't fully understand. After a full slate of NASCAR events, Johnson also qualified and practiced the sports car before suffering an electrical problem during the race that knocked out his drinking system. More...