The Blieman brothers have put up an invert post about a tiny crab invading the ear of a friend with painful results.
This one touches a childhood fear of mine: an invert in the ear. Specifically for me it was a fear of a spider or an earwig crawling in my ear when I was asleep.
Scorpions? No problem. In my boots? Sure, whatever.
Tarantulas, yeah I loved them as pets (Much to Mom's chagrin!)
Earwig on my sleeping bag... Holy Sh*t! Get it (or me) outa here.
Fortunately I eventually outgrew that as an irrational fear, but earwigs are still my least favorite invert. Of course Ceti Eels in the Wrath of Khan did nothing to help matters.