"Say No To Drugs!" joke

Two young men were picked up by the police for smoking dope and appeared before the judge on Friday.
"You seem like nice young men," the judge said, "and rather than sentence you to jail time, I would like to give you a second chance. This weekend, I want you to go out and show others the evils of drug use and persuade them to give up drugs forever. I will see you both back in court on Monday."
Monday morning they both returned to court. The judge asked the first young man, "How did you do over the weekend?"
"Well, your Honor, I persuaded 23 people to give up drugs forever," he replied.
"23 people? That's wonderful! What did you tell them?" asked the judge.
"I used a diagram, your honor," he explained. "I drew two circles like this:
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and told them this (the big circle) is your brain before drugs, and this (the small circle) is your brain after drugs."
"That's very admirable," the judge said. "And you, young man, how did you do?"
"Well, your Honor, I persuaded 183 people to give up drugs forever," the second young man replied.
"183 people! That's amazing!" the judge exclaimed. "How did you manage that?"
"I used a similar approach, sir," he explained. "I drew two circles like this:
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I said, (pointing to the small circle) this is your asshole before prison... "