Wasps, bees, and most of all hornets. I got stung really bad a few times as a kid, and now I do all I can to avoid being stung again. Only bees I can tolerate are carpenter bees because they have no stinger; I actually kinda like them.
Oh, and grubs... they're ****** gross to the point of being horrifying. The first time I ever saw one, my first thought was of a tiny alien creature crawling around, looking to drink some unsuspecting creature's blood.
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