Aaron: Dr. Bishop?
Walter: Walter. I said you could call me Walter.
Aaron: How did your son die?
Walter: Peter was very sick. I tried for a long time to find a cure, but I found it too late and he died. When I discovered the alternate universe where another version of my son was dying from the same malady, so I crossed over to the other side with the intention of bringing him back to cure him. But the frozen lake where I created a portal between universes was unsound, and when we crossed back, the ice broke. Peter, the other version of him, drowned. I lost him all over again.
Aaron: And… you don’t think you belong in a mental institution?