Scores of Japanese children...
Read the excerpt of a person's story about his diseased cat:
Her(the cat's) kidneys shrank to the size of raisins, and now I loved her very much; I assumed the vet was joking when he suggested dialysis. I took her for a second opinion. That number two tested her blood and phoned me at home saying perhaps you should think about euthanasia. I hadn't heard that word in a while and pictured scores of happy Japanese children spilling from the front door of their elementary school. "Are you thinking about it?", he asked. …
What does he mean by saying the colored part?
[Edition]
Oh! Having posted the thread, I came up with the meaning. Now I just leave it as a simple riddle.
Rafee

Rafee: It's called a pun, a play on words, wordplay. Euthanasia = youth in Asia.

Boy, I did not get that at all! I might have eventually, but I'm impressed that you did, Rafee.

I've heard that as a friend-of-a-friend story several times. A student in a debate class or club is asked to prepare to argue a position for or against euthanasia. He comes prepared with statistics and stories about young people in Asia.

Bob: I didn't get it either ... at first. But suspecting it was a play on words, I pronounced it aloud and immediately "heard" the solution. I've run into several puns where, unless I actually spoke them, I didn't get the joke. Funny how the brain/eye/ear works that way.