The Kissing Game: Short Stories by Aidan Chambers
A girl loses her humanity when she takes a summer job as a theme-park character, a boy believes he sees a girl jump to her death, only to discover the same event happened 100 years before; these provocative stories lend themselves beautifully to discussion. The titular story in particular; in which what begins as an innocent game turns deadly, will haunt the reader for a long time after.