Chucks never made me sad. I was just really getting into MMA around the time of Chuck's reign, and seeing him get KO'd like that was haunting. He's my favourite fighter of all time and sad is an understatement.
All the rest weren't pleasant to see, but the one I was least bothered by was Anderson. Felt like the writing was on the wall with him for a while, and I was never a huge fan in the first place.