Where do you get your ideas?

I am often asked where I get the inspiration and ideas for my stories, especially considering that I am fortunate enough to have so many ideas from which to choose. 

This is the kind of question that is impossible to answer with a single sentence, because I never know when I might stumble upon an idea that could make a great book.  I tend to be the kind of person who asks a lot of "what if" and "imagine if" questions, and through these quandaries, many my ideas are born. 

But since that...