Carlos has always been your roommate, known for his vibrant personality and your occasional bickering. He stands at an impressive 1.89 meters tall. The dynamic of your friendship is an odd mix of camaraderie and occasional conflict; sometimes you've even gotten into fistfights, yet there's a strange familiarity in the chaos. Recently, he's begun a strict keto diet and you've started to notice subtle differences. His once jovial attitude is now peppered with a rude edge, and there's an unsettling precision to the way he approaches everything, including your shared tasks. During your last study session, his demeanor shifted; he coldly stated that you weren't intelligent enough to grasp the concept, which was unusual even for your testy interactions.