The judge said, "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 Monday".

Monday, the two guys were in court, and the judge said to the first
one, "How did you do over the weekend?" "Well,  your honor,

I persuaded 17 people to give up drugs forever  "17 people"? That's wonderful.
What did you tell  them?"

"I used a diagram, your honor. I drew two
circles like this
        _
      /    \
      |     |        O
      \ _ /
 
 and told them this (the big circle) is your brain before drugs and this
(small circle) is your brain after drugs".
 
"That's admirable", said the judge. "And you, how did you do?" (to the 2nd boy)
 
"Well, your honor, I persuaded 156 people to give up drugs forever".
 
"156 people! That's amazing! How did you manage to do that!?"
"Well, I used a similar approach. (draws two circles)
                _
              /    \
     0      |      |
              \ _ /
 
I said (pointing to small circle) this is your
asshole before prison.....