Twent percent of kids are nuts:

Almost one in five young American adults has a personality disorder that interferes with everyday life, and even more abuse alcohol or drugs, researchers reported Monday in the most extensive study of its kind.
The disorders include problems such as obsessive or compulsive tendencies and anti-social behavior that can sometimes lead to violence. . . .
Counting substance abuse, the study found that nearly half of young people surveyed have some sort of psychiatric condition. . . .
Personality disorders were the second most common problem behind drug or alcohol abuse as a single category. The disorders include obsessive, anti-social and paranoid behaviors that are not mere quirks but actually interfere with ordinary functioning.

(Cross-posted at The Other McCain.)