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 go as far as to say that religious, and non-religious humanoids are separate species. We seem to be wired differently. Therefore, I'd remove every theist on earth. Hurray. Peace at last.