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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As someone who lives in the deep South, I'm having trouble deciding between mosquitoes and gnats. I'm gonna go with gnats because they're arguably more irritating and I can think of absolutely zero reasons for their existence.