Punch-Drunk Love. I put this one off for a long, long time. I started very skeptical, but it won me over. Brings out sides of Sandler I never knew were there, and gotta respect a movie that drifts so freely from convention when it feels right. My PT Anderson power rankings:

1. The Master
2. Hard Eight
3. Punch-Drunk Love
4. There Will Be Blood
5. Magnolia
6. Boogie Nights