Thermal adaptation is common and of interest in the age of rapid climate change. I discuss thermal performance curves in general, their uses and pitfalls, and their relationships with other prominent climatic patterns (such as e.g. the temperature-size rule). I then present data on an experimental evolution study of the dung fly Sepsis punctum, which was allowed to evolve in hot, cool and variable environments in the laboratory for multiple generations, to investigate whether and how thermal performance curves evolve.