Why do cockroaches die on their back?

Has it ever occur to you that, why do cockroaches die on their back? It's funny isn't it? Can't they just crawl crawl crawl, breathe in some insecticide and then just die crawling halfway, on their tummy?

Naturally, I went and ask "God". My God always have some answers ready for me.

It turns out that one of the reasons is, in our homes, cockcroaches usually die of insecticide. Insecticides are nerve poison. It causes muscular spasms which often result in the cockroach flipping on its back. Without muscular coordination the cockroach cannot right itself and eventually dies in its upside down-position.

So that's it.

There are other questions and answers about cockroach from this website http://www.bio.umass.edu/biology/kunkel/cockroach_faq.html.

One interesting question was asked? What are cockroaches good for?
The answer is :
Fear of domestic cockroach pests is perhaps warranted because they have been associated with the development of childhood asthma and thus it is better not to have them in your home environment.Cockroaches as a group are part of the worldwide food web. They are omnivore scavengers which clean up our environment and help recycle the organic litter that would accumulate if it were not decomposed by organisms which include cockroaches. Furthermore they serve as food for small mammals, birds, amphibians and lizards. There are over 3000 species of cockroaches and only 10 species are on the World Health Organization list of human pests. The other 3000 species are welcome members of the biodiversity on this planet.

And some people might secrete a particular hormone due to genetic anomaly that will attract cockroaches to you..."Interesting"...