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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Spiders, -blam!-ing hate them, I want them gone now and forever so I can live life without fear. -blam!- spiders and all there creepyness, long live the day they are gone and celebrate their extinction.