Harris worked at a fireworks stand, and had received several fireworks as a result. The mascot of Columbine High School (CHS) is the Rebels, and they called the sneaking out "Rebel Missions". Harris and Klebold adopted the nicknames "Reb" and "Vodka", respectively. Beginning in early 1997, the blog postings began to show the first signs of Harris's anger against society. By the end of the year, the site contained instructions on how to make explosives. Harris wrote: "the first true pipe bombs created entirely from scratch by the rebels (REB and VoDkA)... Now our only problem is to find the place that will be 'ground zero'."