Columbine by Dave Cullen:
Eric, Brooks, and Dylan were three aspiring intellectuals. They took an interest in classical philosophers and Renaissance literature. All three boys were shy at that point, but Eric began breaking through his shell. It started with occasional rumblings. Just two months into high school he asked a classmate to Homecoming. She remembered him as nervous and quiet, largely forgettable, until he faked his suicide a few days after the dance.
“He had his friend take me over to his house,” she said later. “When I went there, he was lying with his head on a rock, and there was fake blood around him, and he was acting like he was dead.” It wasn’t an original stunt—probably ripped off from the 1970s classic movie Harold and Maude. But it weirded her out. She refused to date him again.