Mayfly
I can't stand those things. I don't think they bite, and they only live for a matter of hours (one mayfly myth is that they have no diggestive organs), but, still, the way they land on walls and just stay there till they die is creepy. And disgusting. Dead mayflies, when wet sort of melt and that makes the parking lot of the grocery store look like it's covered with fish guts. It smells that way, too. The place is just blanketed with them. Lake Erie shore.