I read this idea many years ago (on this site) that really piqued my curiosity. The idea was that the universe is the inside of a black hole backwards in time,

I read this idea many years ago (on this site) that really piqued my curiosity. The idea was that the universe is the inside of a black hole backwards in time, that is, that the big bang is the final evaporation and the heat death is the birth of it, and that our experiences inside it are what one would expect to experience inside a black hole but backwards in time. I forget the details, I wish I could still find it.