These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Goddamned Bats: Absolutely everywhere in adventure zones: there are snakes, scorpions, spiders, crocodiles, wolves, wild boars, big cats, and just about every other kind of aggressive animal. At least they stop harassing you once you're at least eight levels higher than them.
Goddamned Boss: Very prevalent in the resource zones where mini bosses will rush in and attack players trying to harvest resources. Originally conceived as a way to stop players running automated scripts to harvest resources without actively playing, they have no special tactics, nor are they particularly tough since they scale with the player's level. But they are annoying as hell by virtue of randomly interrupting resource harvesting based on a virtual dice roll.
Scrappy Mechanic: Falling in a corner can sometimes lock you in a unescapable falling animation.