I am going to have to say slogs just because they surprise you when they start attacking especially at the part when you are returning to Rupture farms and you are going through the areas that you started out at. major surprise when the slogs start comming out at you to those who never played the game of course.
Also Clackerz. Even though they are annoying, they do have this hidden sinister nature about them like when you tick them off they will end up shooting you to death later in the game. Kind of reminds me of Hewet family of the Texas Chainsaw Masicure.
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