I've lived in the US all my life and don't look very Asian (I'm often confused for Latino or Middle Eastern), but I can speak the Taiwanese dialect of Chinese conversationally with very little accent. I picked up the language from my grandmother when I was little. It's always fun to see the reactions of other Taiwanese speakers when I suddenly start speaking Taiwanese to them.
Here are some interesting things I've picked up about the Taiwanese language.

1. Same character set as Mandarin Chinese
It uses the same writing system as Mandarin Chinese, but you pronounce the words completely differently. A Mandarin speaker can't understand anything a Taiwanese speaker says, and vice versa. However, Mandarin speakers and Taiwanese speakers can both read something written in Chinese.