In honor of today being National Coffee Day, I thought I'd ask all you coffee lovers out there how far you'd go for a good brew. At more than $100 a pound, kopi luwak, also known as civet coffee, likely takes the title of the world's most expensive coffee. But it also holds the title of world's only twice-consumed coffee.

Before you've enjoyed it, it's been consumed by the palm civet, a cat-sized mammal native to Southeast Asia. The civet, or luwak, eats fresh coffee berries, which are collected by coffee specialists after they've been excreted. The beans are then washed in spring water and sold as coffee.

According to civet coffee connoisseurs, the animal's digestive enzymes help to mellow out the acidity, causing it to taste mild and smooth. I think I could give it a try — so long as you didn't tell me what it was first. What about you? Have you ever tried civet coffee?