In "97 seconds", episode 3 of season 4 of House M.D., House electrocutes himself by putting a knife in socket. But when Wilson asks him what he saw, he does not reply. He wanted to talk to the guy who motivated him for the move, and in the end he told the main dead patient that "I'm sorry, I told you so."
It implies he had no afterlife experience, like the guy who electrocuted himself in the clinic, right?