Letter Of The Alphabet memes

Teacher tests Little Johnny, “OK, Johnny, create a sentence which starts with ‘I’.”

Little Johnny confidently starts, “I is...”

Teacher snaps, “No, Little Johnny. You must always say, ‘I am’.”

Little Johnny sighs, “Yes ma’am. ‘I am the ninth letter of the alphabet.’”

You're so fat the only letters of the alphabet you know are K, F, and C.

I only know 25 letters of the alphabet. Why? I don't know Y.