Anyone who claims to be smart probably isn't (i.e. Fredo)
Anyone who says he's not that clevah (i.e. Solozzo) probably is.

My dog is pretty smart. Does lot of tricks.

"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."