A war of unepic proportions..
The past four or so summers I've been working at an ice cream booth (the sort where you can get scoops as well as packaged ice cream) and aside some occasional boredom fended off with a book or laptop, the only other major issue had been more than a few pesky flies, that manage to fly in and evade most of my attempts to get them out again.
That is, until a different sort of tiny critter made a home somewhere under the ceiling. Being a recovering arachnophobic, I allowed the spider to stay under the condition that it a) doesn't crawl into any of the boxes and b) doesnt fall into my hair.
The symbiosis worked quite well!