I love rare meat. Rare. Bloody. Get me a cut of filet mignon and put it on a hot grill for 15 seconds on each side. Serve it to me and I won't be happier, you'll see me scarf down that cut faster than you can say, "dude you should seriously consider not eat-" but I'll be done by the time you get to finish the sentence. That's how much I love rare meat, no offense to anyone who's vegan/vegetarian.
There are some people, however, who think that it's a good idea to try the rare/undercooked meat concept to different types of flesh. Technically you can do that with fish, like sushi, but eating a properly prepared piece of sushi won't kill you.