Texting/talking on Cellphones while driving.

I've yelled out the window at fellow motorists on several occasions that "you clearly can't do both at the same time, so pick one and get the [expletive deleted] out of the way!".

I'd imagine that the average person would be doing well to walk and chew gum at the same time. This is why crap like cars that park themselves seem like such a great idea to such a broad demographic. It's too bad natural selection has been forced into obsolescence.