What is the worst enemy you have faced in a game?

[MrT-Tar]

DarkCronos said:

The spider ball guardian on Metroid Prime 2. It actually made me abandon the game.

I'm glad Retro adjusted down the difficulty level of this boss on Metroid Prime Trilogy so i finally beat the game after years of swearing.

The same happened to me, 

Fortunately I picked the game up about a month later and beat it on the 3rd or 4th try, strange.