I haven't done this yet. Paid for Larry the Cable Guy, The Benchwarmers, Scary Movie 4, The Wild, and The Wickerman recently, but since I was there to review them I couldn't just leave.
It's not often I stop DVDs without finishing them, but I did toss Ladder 49 after half an hour (boring), and The Rocky Horror Picture Show (five minutes, but also skipped ahead and realized I had made a grave, grave error).
Should have listened to Maddox in the first place:
http://www.thebestpageintheuniverse.net/c.cgi?u=disease