"A lot of the tension in the school came from the class above us," Chad Laughlin states. "There were people fearful of walking by a table where you knew you didn't belong, stuff like that. Certain groups certainly got preferential treatment across the board. I caught the tail end of one really horrible incident, and I know Dylan told his mother that it was the worst day of his life." That incident, according to Laughlin, involved seniors pelting Klebold with "ketchup-covered tampons" in the commons. However, other commentators have disputed the theory that bullying was the motivating factor.