Player performances in the finals/playoffs that got you so disappointed as a fan? (Local/International)

A finals or playoff series brings out the best and worst parts of players and nakita natin with how frustrated fans were for both Ginebra and TNT the past two games (RJ/Japeth/RHJ/Oftana/Nambatac). Which player got you so disappointed in their performance? Can be from one game or a whole series.

Edit: Feel free to add coaches too!