Bodaciously bountiful blonde Beverly D'Angelo presents more than one pleasant mystery. It makes no sense that a woman of D'Angelo's angelic bra caliber would be strapped down to a bumbler such as played by Chevy Chase in all those farcical Vacation movies. The fact that she remains saddled to him and shares her bed and dressing rituals with him is an inspiration and shot of hope to all men who have pratfallen. The other thing that's hard to figure out and fun to think about is why an actress of Beverly's stature has left so much of her big boobs on the silver screen. She's fished the beauties out at least nine times and still counting. Is her eagerness to expose rooted in physical pride? It certainly would be pride well placed.