This should end your discussion. Sorry for being a jerk, it's the least I could do...
http://www.nssl.noaa.gov/edu/ltg/
" US also produce strong upward motions and contribute to frequent cloud-to-ground lightning. There are also high frequencies along the Gulf of Mexico coast westward to Texas, the Atlantic coast in the southeast US, and inland from the Gulf. Regions along the Pacific west coast have the least cloud-to-ground lightning.
Flashes that do not strike the surface are called cloud flashes. They may be inside a cloud, travel from one part of a cloud to another, or from cloud to air. "
I read pretty much that whole article and that's all I could find about it. It's under "Where does lightning usually strike?"
What I got from it was that lightning only strikes from cloud to ground or from cloud to cloud...
"Lightning strokes carry up to 100 million volts of electricty and leap from cloud to cloud, or cloud to ground and vice versa. "
I got this off this page: http://www.mb.ec.gc.ca/air/summersevere/ae00s19.en.html