I've noticed that we get lots of houseflies when we cook meat, must be the protein that draws them. When I swat them I remember why I'm a very efficient fly-killer.
When I was a tiny girl (4 or 5) in Florida we had lots of flies, with 4 kids running in and out of the house you can imagine. My mom paid me a penny a fly to swat them. I got good, y'all. RIP, you nasty devils!