Probably already said. But I would have to say Kano's Heart-Rip in MK1 is CLASSIC.
Sub-Zero's MK1 Spine-Rip was the opitome of gore at the time. And still well done.
Raiden was by far the bloodiest. It was NICE!
All MK1's where nice.
In other MK's I would have to say Jade's MKD Spear throufh head and do a flip was eliguantly done.
All Stage-Fatalities where nice in MKD. I like the almost rag-doll feel of MK4's fatlities. They had a crudeness that was speacial that was lost when it went DA.
MK3 Fatalities, to me, where actualy Friendships. They in NO way had the gore MK1 and 3 had. They where poorly done. The ideals where good at times, but with the amount of characters soon to come in UMK3 and MKT, detail was chucked out the windo for quantity. And without detail, they are basicaly JUST jokes. A decapitation would have no blood-buble, and would not fall over, or wiggle in decapitated flaws. The head would not roll. An MK3 Decap was just a head graphic cut and pasted off. People at home could and HAVE done better.
Sub-Zero's new finishers where GREAT in MKD. They where brutal in MKD! Giving back the brutal pride to MK. And there are some good others. But I can't think no more about some more of my favorites.