Billy’s whistle isn’t part of the act, which he doesn’t think of as an act but his dumb self, the one he shows to guys like Nick and Frank and Paulie. It’s like a seatbelt. You don’t use it because you expect to be in a crash, but you never know who you might meet coming over a hill on your side of the road. This is also true on the road of life, where people veer all over the place and drive the wrong way on the turnpike. - P7