You probably need to do a bit more reading. You must remember the factors required to create a thunderstorm. They are quite basic weather theory
Moisture is one factor, as you are saying, but it is not the only factor. You fundamentally need an unstable airmass, otherwise when and if the air is lifted, it will not continue to rise and build into a CB.
Was this a serious question, or did I miss the joke?
TvR