They've learned how to feign death. I was swatting one yesterday and I got him into the death-trap (up against the window) and I took a light smack at him, and he fell like Liedson. He just laid there, upside down. I took a few steps back and the bastard darted off again, but then I swatted him again and made him one with the wall. So watch-out, these bastards are getting smarter.
Yep,They are technically sound Motherbuggers. If you zapped them with Vinegar they probably would Give you less of a Fight.
One time I swatted a fly and it rolled around in agony for like 20 minutes. Then it flew away. I named him Vitor Baia