After a few months, the man (named Jerry) has become very depressed. He simply cannot handle life with his crippled body, so he decides to end it all. He goes up on top of a large building and prepares to jump. But, when Jerry looks down, he sees a man below who has no arms at all. More interestingly, this man is jumping around and dancing, just having the greatest time.
"hmmm" thinks Jerry, "how is it that i'm so sad with just one arm, yet the man with no arms is dancing with glee?"

So Jerry goes down to ask the man in person. He explains to the man his situation, and asks him: "What's your secret; how do you stay so happy that you can dance with joy even with no arms?"
The man says "my balls itch"