The belief that anything said in a foreign language, even if it makes absolutely no sense whatsoever, sounds cool because no one can understand it.

Corollary: Anything said in French sounds mocking. "Tu es un parapluie et tu douches avec un plat de fruit!"

I've gotten slapped by girls after making that sound like an insult, since they had no idea it meant, "You are an umbrella and you shower with a plate of fruit!" and just assumed I was being condescending.