As I stated in a similar thread, I think it's time for the jokes and laughing to die down as many come to the realization that this kid may have a real mental problem. Schizophrenia and bipolar disorder both tend to appear in the teen to early-twenty years, and both are devastating to both an individual and his or her family. There are other possibilities such as strange metabolic or infectious causes, but all signs point to a psychiatric etiology as the most likely culprit.
If so, my thoughts and prayers go out to him and to those who are close to him.