Yet another VIPPER with a dead flies story:

My family owns a centuries-old vacation house in a sufficiently scary state of disrepair that there's one very specific room that should never be opened once the fly season starts: every year, starting around September, thousands of flies claim it as their hangout.
Other rooms have it quite bad with flies (and mosquitoes, and rodents, and pigeons, and crows, and bats, and ghosts), but generous amounts of nasty chemicals keep most of those problems under control.
Except for this specific room, it is beyond saving. There are hundreds of ways for them to get in. We only managed to reduce it to ninety-six ways by changing the broken windows two years ago.
Every summer (you do not want to try living there from November to April), shovelfuls of dead flies have to be scooped from the floor, the corpse pile always appearing neatly bundled near the window facing South. There was more than half a plastic grocery bag worth of them last year.
I love this house.