John Nash went off his medications because they affected his ability to think, to reason, and to do his work. After a short period of time, he slipped back into his hallucinations and delusions. Rather than be committed to the mental hospital again, he chose to reason his way through his affliction. He said goodbye to his delusional friends, Parcher (Ed Harris), Charles (Paul Bettany), and Marcee (Vivien Cardone). After that, he simply refused to acknowledge their presence when they did pop up. Whenever he was confronted by someone he didn't know, he asked someone else whether or not they could see that person. He took his lunch outside to eat alone rather than have to interact with other people. Eventually, he was able to resume teaching classes. One day, coming out of class, he is approached by an unknown man (who turns out to be real) who informs him that he has been nominated for the Nobel prize in economics for his work in game theory. They go to the faculty dining room for tea, someplace that Nash hasn't been for years. As Nash and the man talk, the other faculty members start walking over one by one and laying their pens in front of him. In the final scenes, John and Alicia (Jennifer Connelly) are in Stockholm where he is presented with the 1994 Nobel prize. As he and Alicia leave the auditorium, John sees Parcher, Charles, and Marcee standing there. Alicia asks him what's wrong. "Nothing" is his reply: "Nothing at all." Edit