Every new Mortal Kombat game works really hard to out-gore the previous game, and so far, is succeeding! They evolved into other options, like Babalities, Animalities, etc., but still the most exciting thing MK has is the Fatalities.
The X-Rays are pretty brutal, too. So, to celebrate the release of the new Mortal Kombat X, here's a cool video put together by IGN, of all the Fatalities and X-Rays (so far). In glorious HD, so you can see all the gore and violence in High Definition!