Silk.

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↓ Transcript
A man is walking with a shopping cart. A woman, behind him, begins the conversation.

Woman: Excuse me. Can you spell silk?

Man: What? S-I-L-K.

Woman: And what do cows drink?

Man: Water?

Woman stands in an indignant pose with hands on waist.

Woman: You were supposed to say “milk”.

Man: Why?

Woman: Well, that's what normal people do.

The man is seen walking away with his shopping cart.

Woman: What an odd person.

Man: What an odd person.

Title: Silk.