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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I'd say spiders or snakes. [spoiler]uh I -blam!-ing hate snakes. Slithering around with there stupid tungs out [/spoiler]