What is the funniest language mix-up, association, or sound you ever came across?

Also, the logo of the British sushi chain YO! is amazingly similar to the Hebrew word יפני (Japanese).

http://www.yocompany.biz/yosushi/index.html

I once mixed up the Spanish word ahora (now) with a totally different Japanese phrase. it was not a curse, but it still did not make much sense. now I will start to look at アメリカ the wrong way...

how do you pronounce the Hebrew word?

I knew a Costa Rican guy who had trouble pronouncing the differences between beach and ***** apart.

So when he tried to ask, "Are there many beautiful beaches in California?" it came out pretty differently.