[ WP ] Marty McFly asks Doc Brown what his Ph.D. is in . The answer is not what Marty expected ...

`` I do n't have a PhD.'' 
 
 `` But, doc...'' 
 
 `` I have an MD, Marty. I am a medical doctor. I began working on a project called the `` Unlimited Mind Key Project.'' We had a theory about intelligence on our team. By our estimation, we could increase the IQ of person almost exponentially and almost limitless, but there was an exchange. See, we ca n't just magically make you smarter without giving something up. Mozart was a genius, but socially inept. Hawking lost the use of his body. We knew that if we could unlock the key, we could make the tradeoff. But we had no idea what you would have to give up! I developed the serum, but it failed to meet the safety requirements for phase one trials. But it worked! It did.'' 
 
 `` How do you know it did, Doc?'' 
 
 `` Well Marty, I used to be a real different person...'' 

