499 U.S. 585, 111 S. Ct. 1522, 113 L. Ed. 2d 622, 1991 U.S. LEXIS 2221, 1991 A.M.C. 1697, 91 Cal. Daily Op. Serv. 2729, 59 U.S.L.W. 4323, 91 Daily Journal DAR 4419