Old lady comes in to an ice cream shop

Lady: 1 scoop of chocolate ice cream.
Clerk: We do not have any chocolate ice cream.
Lady: Please give me an ice cream soda then.
Clerk: OK. What flavor ice cream?
Lady: .... Chocolate ice cream please
Clerk: Lady, we do not have any chocolate ice cream.
Lady: Well then please be me an ice cream Sunday.
Clerk: OK. What flavor ice cream?
Lady: .... Chocolate ice cream please.
Clerk: Lady, we do not have any chocolate ice cream!!!
Lady: Well then please be me a banana split.
Clerk: OK. Great! What flavor ice cream?
Lady: .... Vanilla, ... Strawberry, ... and chocolate ice cream please.
Clerk: LADY, we do not have any chocolate ice cream!!!!!!
Clerk: Lady, how do you spell the 'Van' in Vanilla?
Lady: V A N
Clerk: Great... I know you are listing. How do you spell 'STRAW' in strawberry?
Lady: S T R A W
Clerk: Terrific... Now I a sure I know you are listing. How do you spell 'FLIP' in chocolate?
Lady: There isn't any flip in chocolate!
Clerk: Well, that is precisely what I have been trying to tell you.