With only four contestants remaining, the mob has clearly gotten involved, trying unsuccessfully to whack one of our stars by way of an exploding “American Idol” set! (There is a lot of dirty money to be made in those “Idol” office pools, ya’ll!)

It became painfully clear within the first five minutes of the show who deserved to compete in the finale. When the Final Four performed “School’s Out” with Slash, Allison and Adam shone, especially juxtaposed against Gokey and Kris.

Did you see them harmonize on the bridge together? They weren’t just singing; they were performing!

Yes, Gokey threw in a few good runs here and there and thankfully did not grace us with his screaming again. But Kris just sang a verse and a few unenthusiastic “whoas.”

It was down to three on the 300th episode last night.

The show opened up with a “Night at the Museum: Battle of the Smithsonian” promo featuring Ben Stiller and friends (and by “friends,” I mean “castmates”).  Apparently the “Idol” judges’ desk is a new addition to the Smithsonian’s collection.

Seacrest opened the show by touting the upcoming bout as “acoustic rocker vs. glam rocker,” “Conway (Arkansas) vs. California” and “the guy next door vs. the guyliner.”

First things first: A big “bugger off!” to all the spoilers. You know who you are -- anyone using the social networking site known as “Facebook.”

But let's get to the show.