A guy comes to the hospital to see a friend who was about kicking the bucket.
"What happened?"
"Well, I started helicopter flight training."
"Yes, I know. But you had passed every exam."
"Yes, but the day I first soloed the helicopter I took off without any problem. I climbed to 5,000 feet and started to stare the awful majesty of the lands, the people looking like ants, and so on. I climbed further up to 7,000 feet, and wonderful. I climbed further up to 9,000 feet, and amazing. And then to 12,000 feet, but as it started being chilly I switched the fan off, you know, the big one over the cockpit, and then ..."