The devil put the man to work on a rock pile with a 20-pound sledge hammer in 90 degree heat with 90% humidity.
At the end of the day, the devil went to check on the man, only to find him smiling and singing as he pounded rocks. The man explained that the heat and hard labor were very similar to working in the steel mills with his daddy.
The devil told his demon to turn up the heat to 100 degrees, with 100% humidity.
At the end of the next day, the devil again checked on the new man, and found him still happy to be sweating and straining. The man explained that it reminded him of the old days, when his granddaddy worked in the coal mines.
At that, the devil told his demon to lower the temperature to -20 degrees with a 40 mph wind.
At the end of the next day, the devil was sure the man would be miserable. But, instead the man was singing louder than ever, twirling the sledge hammer like a baton in the frost and ice.
When the devil asked him why he was so happy, the man answered, "The Eagles must have won the Super Bowl!"