Here's a hilarious gallery of former (and some present) psychos on One Tree Hill. This made me feel nostalgic for the days of a good, ole fashioned resident crazy in Tree Hill. My top 5 favorite OTH psychos are:
5. Sensitive Singer/Songwriter Psycho
4. Good Girls Go Psycho
3. Gimme a P-S-Y-C-H-O
2. Psyco Nanny Carrie
1. Psycho Derek
Psycho Derek wins because I've never been able to resist a good stalker subplot on a teen show.