Final answer:
Mental states can be realized by various physical mechanisms, as illustrated by the example of encountering aliens in movies and TV shows.
Step-by-step explanation:
An example often used to illustrate the concept of multiple realizability of mental states is the idea of encountering aliens in movies and TV shows. In these fictional scenarios, aliens are often depicted as having different physical forms, yet still possessing mental states such as consciousness, emotions, and thoughts. This demonstrates that mental states can be realized by various physical mechanisms, as aliens can have different physical bodies but still exhibit similar mental capacities.