The opening scenes in the Don's office.

Santino's face when Bonasera is kissing Vito's hand...he raises one eyebrow in a gesture that suggests, IMHO, "Oh please, give me a break."

Santino's face after this exchange:
V: Santino, go tell your brothers that I want them to come with me to visit Genco and pay their respects.....
S: Ah, pop, Michael?
V: All my sons.

Santino's face when Vito scolds him, "I think your brain is going soft....."

-A Streetcar Named Desire-

Stanley: You want a shot? (offers liquor)
Blanche: No, I rarely touch it.
Stanley: There's some people that rarely touch it, but it touches them often.