Episode 4 of the PBS show Fabric of the Cosmos is truly mind bending. In this episode Brian Greene talks about multiple universes and how the math proves that many universes could theoretically exist. The evidence for this comes from the fact that the universe is expanding and the math of string theory. The possibility that there could be another copy of me in another universe with a blog which has more than ten readers is very disturbing.
You can watch all the four episodes of Fabric of Cosmos online.