In Argentina there's no such expression. But we use "¡Cómo no!" a lot, for the dismay of tourists and language students. An architect from Chicago I helped 20 years ago seemed to have a lot of troubles in shops because each time she asked "can I take a look?" she understood she was getting a resounding "No" as an answer. She couldn't explain the smiles when such harsh answer was given.
I explained to her that phrase to be short of a polite "How would someone decline your request?". On my part it took some time to me to get used to "Help yourself" not meaning they weren't telling me to go to hell.
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