Find out what he likes, and what he doesn't! Do you think it is possible that your best friend and your spouse are one and the same person? It helps if he is really into movies, but feel free to skip this one if you are uncertain about it.
What will people say at your funeral? Having a best friend is great.
Similar to the drop the mic moment question, this one will give him a chance to tell you about a story that is important to him.