The guy with three balls

There was this guy born with three testes. After news of this spread in his school, everyone started making fun of him. Everywhere he went, his schoolmates would start chanting, "Here comes Three-balls! Here comes Three-balls."

He was so humiliated that he took a sharp knife and cut his extra ball off. When his parents found him bleeding on the floor of the bathroom, they took him to the hospital. Fortunately, he recovered and eventually became well enough to come back to school. But the news of this incident had already reached the school. When he appeared, now people started shouting, "Here comes Two-balls! Here comes Two-balls."

Now this guy was so stupid that he thought this was abnormal too. So he took the knife again and cut another ball off. After a spell in hospital, he returned to school and again the chanting began, "Here comes One-ball. Here comes One-ball."

And you guessed, this guy was so stupid and embarrassed by all this that he decided to cut off his remaining ball too. After another lengthy spell in hospital, he returned to school. At first, all his schoolmates were silent. Then they began chanting, "Here comes ___________! Here comes _________!" (insert the name of the friend you are telling the joke to.)

Obviously, this joke only works if your telling it to a group of friends and your intended victim is also present.