Waiter: Do you want cream or sugar in your coffee?
Lojbanist: Yes.
Proper response is "I do." :D Unless you drink your coffee with neither...
Also, that would depend on the waiter's emphasis of the sentence:
"Do you want CREAM or SUGAR in your coffee?"
means:
"Is this true: (You want cream in your coffee. ⊕ You want sugar in your coffee.)?"
"Do you WANT cream or sugar in your coffee?"
means:
"Is this true: (You want cream in your coffee. ∨ You want sugar in your coffee.)?"
("⊕" is XOR, "∨" is OR.)
So presuming the waiter emphasised "cream" and "sugar", not "want", "yes" or "I do" are not proper responses.
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