a small bit of an enormous genius
Y 

"Why" is the only question that bothers people enough to have an entire letter of alphabet named after it.
The alphabet does not go "A В С D What? When? How?" but it goes "V W X Why? Z."
"Why?" is always the most difficult question to answer.  You know where you are when someone asks you "What's the time?" or "When was the battle of 1066?" or "How do these seatbelts work that go tight when you slam the brakes on, Daddy?"  The answers are easy and are, respecively, "Seven-thirty-five in the evening," "Ten-fifteen in the morning," and "Don't ask stupid questions."
But when you hear the word "Why?", you know you've got one of the biggest unanswerables on your hands, such as "Why are we born?" or "Why do we spend so much of the intervening time receivibg junk mail?"
Or this one:
"Will you go to bed with me?"
"Why?"
There's only ever been one good answer to that question "Why?" and perhaps we should have that in the alphabet as well.  There is room for it.  "Why?" doesn't have to be the last word, it isn't even the last letter.  How would it be if the alphabet ended, "V W X Why? Z," but "V W X Why not?"
Don't ask stupid questions.

by Douglas Adams