Comment by gus_massa

I'm trying to think a good example in Spanish. Probably double negatives like:

"Hoy no comí nada." -> literally "Today [I] did not eat nothing." but should be "Today, I didn't eat anything."

May be confusing, but people may ask for clarifications.

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Another problem is that some words have different meaning in each country, like

"I will pick an apple." -> to es-es "Voy a coger una manzana" but in es-ar it means "I will fuck an apple."

May be confusing too, but if you have a strong Spanish accent or American-that-Learned-Spanish-from-Spain accent, people will chuckle and go on.