Shawn: Do you remember what I told you when you predicted you could do this for 1,000 years?
[flashback:]
Michael: The time has come to innovate. The human afterlife can be more fun. For us, obviously, not for the people we're torturing. Who cares about those dummies? [laughs] I present to you the perfect recipe for my proposed experiment. Four people, perfectly suited to make each other miserable. I'm going to design an afterlife where they torture each other.
Shawn: We've tried this. Humans are very reticent to torture each other. Even getting them to do simple things like pulling out each other's teeth is like... I can't think of the right analogy.