There are very few I don't love, but if I have to pick a favorite it would be "a Day in the Life" simply because it was an instant piece of classical music (an lyrics), and it clearly established the Beatles as the best musical group of their age.

"Io sono stanco, sono imbigliato, and I wan't everyone here to know, there ain't gonna be no trouble from me..Don Corleone..Cicc' a port!"

"I stood in the courtroom like a fool."

"I am Constanza: Lord of the idiots."