Young love will make teenagers do the craziest things. Immaturity, inexperience, surging emotions and raging hormones can turn the tiniest crush into the love of a lifetime, and make casual encounters seem like torrid affairs. Sparks flew when 17-year-old Hannah Stone began dating Spenser Krempetz, 18. And when Stone’s mother, Barbara Keim, tried to break them up because of Krempetz’ drug use and bad influence, she paid for it with her life.