Beneath the banter, the all-too-vivid recollections of the sock hop, the prom, the yearbook caption under your photo, Keyes makes a serious and pathetic observation: there are people for whom high school is the peak, the zenith of their success and achievement. After graduation, it's downhill all the way. Serious despite his sophomoric style, he suggests that happy or miserable the high school years are the most intense, vivid time of our lives. ""One of the least recognized wars being waged in the country is that between the innies and the outies,"" says Keyes, who believes we spend the rest of our lives trying to live down the image of class nerd, shnook or dumb jock. Sometimes the reversals are dramatic: Henry Kissinger was known as ""a little fatso""; George McDonald, today a porno star, was a lettered athlete and student body president. Keyes cites plays, books, movies, and songs which confirm ""the fear that high school social structure will be cast in concrete."" Or--for the prom queen and quarter-back--that it won't be.