Just Because

Little Girl: "This looks like a good place to put this letter Y. It's a letter that comes after X and just before Z. I bet Grover doesn't know what this letter is!"
Grover: "Skedaddle... skedaddle... skaddle-UP! I bet you think Grover does not know what this letter is."
Little Girl: "Well, Grover, do you?"
Grover: "No."
Little Girl: "I didn't think so."
Grover: "It's very pretty! It starts out with one line at the bottom and splits into two lines at the top."
Little Girl: "That's what it looks like. But what is this letter called?"
Grover: "I do not know. Tell me."
Little Girl: "Y." (sounds like "Why?")
Grover: "Because I want to know."
Little Girl: "Y."
Grover: "So I can be smart. Please tell me."
Little Girl: "I already did!"
Grover: "You did?"
Little Girl: "Hmm-hmm."
Grover: "Would you tell me again?"
Little Girl: "Y."
Grover: "Because I did not hear you before."
Little Girl: "Y."
Grover: "I don't know! Maybe my ears are on backwards! How should I know?!"
Little Girl: "Grover, let me give you a little hint."
Grover: "All right."
Little Girl: "This is the letter that you hear at the beginnings of words like yellow, yarn, year, and yo-yo."
Grover: "Hmm... It has a cute little yih-yih sound, but I do not know what it is called."
Little Girl: "Y."
Grover: "Maybe because NO ONE WILL TELL ME!"
Little Girl: "Y!"
Grover: "How should I know?! Maybe no one likes me!"
Little Girl: "Y!"
Grover: (crying) "I don't know why no one likes me! I try to be so nice..."
Little Girl: "The answer is Y! Y-Y-Y! The letter is called Y, like W, X, Y, Z!"
Grover: "...That's the letter Y?"
Little Girl: "That's what I've been trying to tell you!"
Grover: "... I am sooo embarrassed..."