An hour after pulling out of Spokane Monday, Greyhound passenger Ed Comello began suspecting that the man in the next seat was having a conversation with him. 'I was gazing silently out the window,' Comello said, 'and I could hear the guy next to me going on about having to get to Tacoma tonight and how 'if your mama's sick, you got to go visit her.' I assumed he was talking to the person across the aisle, but when I looked across, the seat was empty.' Comello added that he was afraid to acknowledge the possible conversation for fear of prolonging it. 