As he grew older and stronger, the only subject which Starkweather excelled at was gym, where he found a physical outlet for his rage against those who bullied him. Starkweather then began to bully those who had once picked on him. Eventually he felt rage against anyone he disliked. In this period as a young teenager, Starkweather went from being one of the most well-behaved teenagers in the community to one of the most troubled. His high school friend Bob von Busch would later recall: