As I get older, I must think about things more. Often I wonder what life would have been like had I taken a different fork in the road: gone to a different university, done that PhD, taken a different job, not had children, married someone else, taken the job offer in California and so on. I expect everyone wonders this sort of thing. In a multiverse, maybe we do follow all possibilities but we are not aware of them. I often wonder.
See http://www.bartleby.com/119/1.html .