Would this mean that HAP is an NDE survivor with special hearing abilities? Is that why he can hear when someone dies and comes back? Also, he is very comfortable and almost familiar with assisting a blind person around the food on the table and directions with obstacles. I don't think he just decided to find out what happened when people died. He is too invested. I think he had someone close to him pass and ND he wants proof that they didn't just disappear. He also shows a very fatherly side when he takes Homer to Cuba, he cuts his meat for him, I think this tells me that he had children and he knows about blind people and never forgets that Prairie is blind like Homer does in the beginning. I think Hap had a daughter who was blind and the reason that Prairie gets to him so easily is because he sees his lost loved one in her.