Good, Bad & Sensational

Ideas of what's the worst change over time. 30 years ago Michael Medved (now a moralistic conservative radio talker, then an aspiring film critic) named "Plan 9 from Outer Space" as the all time stinker in his book "Golden Turkeys."

But that was before "Troll 2," which came 20 years ago, and was widely "praised" as the worst of all time. Now, in the documentary Best Worst Movie, Michael Stephenson chronicles what it's like to be involved in a cult hit so excruciatingly awful that it becomes a surprise smash.

Audio: NPR's All Things Considered 5/14/10.