From insects to annelids, we humans have a love-hate relationship with creepy crawlies (or "sluggies," in some cases). Some, like earthworms, enrich our soil. Others, like locusts, can annihilate crops. But then there are the "icky" bugs which, regardless of whether they are harmless or harmful, make even the most fearless among us shriek and run out of the room. Here are just a few to make you squirm.