Columbine by Dave Cullen:
Eric and Dylan planned to be dead shortly after the weekend, but Friday night they had a little work to do: one last shift at Blackjack. The job had funded most of Eric’s bomb production, weapons acquisition, and napalm experiments. Blackjack paid a little better than minimum: $6.50 an hour for Dylan, $7.65 to Eric, who had seniority. Eric believed he could do better. “Once I graduate, I think I’m gonna quit, too,” Eric told a friend who’d quit the week before. “But not now. When I graduate I’m going to get a job that’s better for my future.” He was lying. He had no intention of graduating.