AFI #033 Estelle Reiner as Customer from When Harry Met Sally (1989)

Harry: You don't think that I could tell the difference?
Sally: No.
Harry: Get outta here.

[Sally begins to fake an orgasm]
Harry: Are you OK?

[Sally continues very audibly, attracting the attention of nearly every customer in the cafe. Afterwards, she returns to eating her dessert]

Older Woman Customer: [to waiter] I'll have what she's having.

- Estelle Reiner as a Customer from When Harry Met Sally (1989)

The bolded line is ranked #33 in the American Film Institute's list of the top 100 movie quotations in American cinema.