Two young guys are picked up by the cops for smoking dope – they appear in court on Friday. The judge says, "You seem like nice young men, and I'd like to give you a second chance rather than jail time. I want you to go out this weekend and try to show others the evils of drug use and get them to give up drugs forever. I'll see you back in court on Monday."
On Monday, the two guys are back in court. The judge says to the first one, "How did you do over the weekend?"
"Well, Your Honor, I persuaded 17 people to give up drugs forever."
"Seventeen people? That's wonderful! What did you tell them?"
"I used a diagram, your Honor. I drew two circles like this - O o - and told them that the big circle is your brain before drugs and the small circle is your brain after drugs."
"That's admirable!" the judge says. He turns to the second guy. "And you, how did you do?"
"Well, your Honor, I persuaded 156 people to give up drugs forever."
"One-hundred fifty six people! That's amazing! How did you manage to do that?"
"Well, I used a similar approach. I drew two circles - o O - and said, pointing to the small circle, "This is your rectum before prison..."