Medical Insurance When Traveling

Have you ever purchased medical insurance when you travel? I've always wondered how important and necessary it is but sometimes things are really unpredictable and you don't really want to be slapped with a huge hospital bill when you're lying in a foreign hospital. So, I guess its good to consider travel medical insurance if you're planning a long two-week trip, just to be on the safe side. After all, the premiums are usually quite affordable.