The proof of Sonny's stupidity, and his letting his temper get the better of him was that in a calmer moment, he made sure that Michael had bodyguards taking him into New York when he went to see Kay (btw what happened to those body guards when he went to the hospital?).
"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."
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