Title says it all.
inb4Humanity
Edit: Not remove from memory; they just immediately die out.
For me, ticks. Hate those freaking things.
Edit: I swear, if one more person says spiders or snakes...
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[url=http://en.wikipedia.org/wiki/Scutigera_coleoptrata]S. coleoptrata[/url], AKA house centipedes. I encounter them a lot here, sometimes in bathrooms. They are fast and I have constant anxiety about when the next of the devil's spawn will dart into sight.