I am convinced that cockroaches are Zombies. They just never die no matter how much of their bodies' are squished. I am not buying the "it's just nerves" moving bit either. I have let them for dead left to get something to pick them up with and come back to find them gone. I follow the trail of goo and find them, of course. Squished and still alive! Zombies, I tell ya!!!
Yuck. I'm not pitching ABC Pest Control or anything but we're on a monthly deal where they come out and spray around the exterior of the house. Haven't had a single roach or any other bug in the house in over a year. And the couple I found in the garage were feet up DEAD.