why are watermelons green?

oops. that's all I can say.
Well, actually I'm perfectly capable of saying many other things, so I will go ahead.
Anyway, on to the watermelons. Why are they green? or are they? I once saw a purple watermelon while on a fishing trip. Rather shocked to find a melon of such hue, I had to ask, "what makes you purple?" The watermelon didn't speak for a very long time, and I finally gave up. My guess is that it was pondering my question for a very long time and finally decided that it was just not going to answer.
well, a couple days later, I found a letter addressed to me, and, to my surprise, it was from the purple watermelon, whose name was Stephen Pickens.
Here is what the letter said:

My dear sir,
I am sorry that I did not immediately answer your (most interesting, I must say) question, and I wish to make up for my mistake. That is the purpose of this letter.
To answer your question, I must first ask a question of my own: "why not?" Why wouldn't I be purple, such a deep, lustrous color, which represents such high things as royalty and upper class? Why are all the others green? [at this point, I stopped, and wondered why, since he had said "a question", he had asked 3. But I read on]
Here is the answer to your question, very simple indeed: think on the inside, not the out.

-your friend Stephen Pickens


After reading over the whole letter once again, I realized that the inside of watermelons are red, not green.
but then I wondered what color Stephen Pickens was inside, and I still haven't figured it out.