If someone were to come up to you and ask you the question "Who are you?", what would your response be? Well, I guess the natural first reaction is to quip back, "Well, who the heck are you?" But really, have you ever stopped to think what it *really* is that makes you, well, you? What would have to change for you to stop being yourself? Is there any way to revert those changes? In this class, we will talk about some existing theories of identity and try to wrap our heads around some thought experiments which challenge our preexisting notions. Students will be encouraged to provide their own thoughts and ideas on the matter as well.