those frigging ladybugs
Residents of the Midwest (including most of us here in Chicago) have been plagued by an invasion of imposter ladybugs -- the "multicolored asian lady beetle." These particular bugs will bite, crawl into your home through any available crevice (to hibernate for the winter), and apparently stink and stain if squished. It seems our well-meaning FDA brought them in to help control aphids (which they do quite well) but they've since performed some super-adaptation on these shores and the laws of unintended consequences have taken over. don't say your gubmint doesn't love ya -- they're here for your tomato garden's benefit. honest!
There are a lot of links out there on this phenomenon but OSU has some especially informative material.