If the fear centres of my brain weren't completely full up with spiders (and that's just given me a mental image that's going to squat in my head for a few weeks) then I think Dishonored might have given me a serious phobia of rats.
Seriously: Dishonored's interpretation of our long-tailed friends is horrible. Your first proper introduction to its horrible scuttlers is when a swarm of them attack and kill a pair of guards, quickly reducing the corpses to red stains on the floor. Shortly thereafter, you have to sneak past another load by throwing a corpse to them as a tasty, putrefying distraction. They're fast, they're lethal, and they swarm – and “swarm” is always a pretty scary word. Brr.