You obviously aren't in an area that's been infested by stinkbugs yet.

https://en.wikipedia.org/wiki/Brown_marmorated_stink_bug

Once winter hits, they start worming their way inside buildings to take advantage of the heat, and they can squeeze in through the tiniest cracks. During the winter I usually catch two or three per day in my apartment, and when I open the windows for the first time in spring, there are usually piles of dead ones that got trapped between the glass and screen.