When I was visiting some freinds in PR, we were walking on a street and all of a sudden we were surrounded by this swarm of little knats ... of course I yelled out:
"De donde carajo salieron todos estos bichos!"
Translated to english "where the hell did all these bugs come from?"
Well little did I know that in PR the word "bichos" which to me means "bugs" to them means "cu*t" ... my freinds mother and grand-mother looked at me like they wanted to wash my mouth out with soap ... it wasn't until Zoriya told me what it meant that I understood what I said wasn't what they understood.