Maybe this guy has a shoe fetish. Maybe he helps old ladies cross the street. Maybe he kicks small animals when no one's looking and validates it to himself because he's unhappy with his job (or he ran out of cheez-its). The point is, Billy Pilgrim might be sitting right next to you and you'd better be ready for a strange answer when you ask him for directions. He may have just returned from planet Tralfamadore and he gets a tad disoriented after time-traveling...
"I look at you sometimes," said Valencia, "and I get a funny feeling that you're just full of secrets."
"I'm not," said Billy. This was a lie, of course. He hadn't told anybody about all the time-traveling he'd done, about Tralfamadore and so on.
"You must have secrets about the war. Or, not secrets, I guess, but things you don't want to talk about."
"I'm proud you were a soldier. Do you know that?"
"Was it awful?"
"Sometimes." A crazy thought now occurred to Billy. The truth of it startled him. It would make a good epitaph for Billy Pilgrim- and for me too.