"Sam is in a messed up place. Of all the messed up places Sam has been, this kind of takes the cake. I mean going to Hell and back, people have always asked me how I've wanted the show to end. I'm like, "I think it would be fun for Sam and Dean to die." Well Sam has died, Dean has died, we both have died, we've both been to Hell, we've been to Heaven, so I don't know of anything that can take us down."