Actually, it's a lack of questions that usually spark mine. I do a little dance and say, "Let's get this party started!"
Sometimes, another person's question will spark an idea. I try to jot down questions as I think of them.
How many Questions/Answers on this site, spark the need for you to ask a question of your own?
I am with Joy..... Her sets of questions usually spark a "I must support her" kind of thinking. And then my wheels start turning.....
Often another's question sparks one of my own.