To describe mental states that precede aggression and violence, people frequently use words related to hot temperatures. Two experiments examined whether exposure to words related to hot temperatures increases aggressive thoughts, even in the absence of heat. In both experiments, participants were first exposed to words related to either heat, cold, or neutral concepts. Next, participants completed measures that assessed aggressive cognition. In Experiment 1, participants completed a word stem completion task in which some word stems (e.g., "ki _ _") could be completed with either aggressive (e.g., "kill") or nonaggressive (e.g., "kiss") words. In Experiment 2, participants were presented with an ambiguous description of a person and then provided ratings regarding that person's hostility. In both studies, exposure to hot temperature words, relative to cold temperature and neutral words, increased aggressive thoughts and hostile perceptions. These findings show a strong link in memory between words related to hot temperatures and aggressive thoughts and biases. © 2009 Elsevier Inc. All rights reserved.