Moments before Chem's class starts. Hey, I've got a trivia question for you. When was the last time the Kennedy kids were in a classroom that wasn't chemistry? The first person to email me the correct answer gets a package of Britney Spears bubble gum. Lily is trying to engage Josh in a conversation about the prom dress and matching cummerbund she just bought, but Josh is elsewhere emotionally. Lily is freaked, thinking Josh doesn't want to go with her anymore. Josh explains that he just doesn't want to talk about prom right at that moment. Chem starts class and announces that she's been required by a George W. Bush education policy to start teaching a standard chemistry curriculum. Good God, it's about time someone realized that Chem hasn't taught a single lesson this year that even resembles high-school chemistry. But do they start doing actual experiments with chemicals and Bunsen burners? Nope. Due to some logic that I can't follow even though I've rewound this scene about seven times, the kids have to pair off and do trust falls. Something about lab partners being able to trust one another. Whatever. You know, I have a feeling that the trust falls are actually there in order to underline this episode's central theme which -- I'm taking a wild and crazy guess here -- is trust. No, I swear! I've never seen this episode before!

Chem lectures about the whole philosophy behind trust falls -- earning your partner's trust blah blah blah. Sam falls happily into Brooke's arms. Lily, on the other hand, is grimacing as she falls into Josh's arms, and Nicole doesn't lift a finger to catch Mary Cherry, who falls to the floor with a thud. Harrison and George -- still chilly towards each other thanks to Harrison almost hooking up with Sam and being caught by George -- just stand there with their arms crossed. Chem asks Harrison what the problem is. Harrison says he just doesn't feel comfortable. Chem calls Harrison an "inherent mistruster" for not submitting to a trust fall. "Is there a reason no one has your back?" she asks him. Sam and Brooke barely hide their amusement.

At lunch, Sam and Brooke discuss their plot against Harrison and wonder if they're being too harsh. George walks by and exchanges hellos with Brooke. Sam also calls out hello to him, but he ignores her. "Trust can be restored, Sam," says Brooke. She convinces Sam that the best way to get George back is to tell him the truth: that she thought she was going to die and can't be held accountable for such an irrational action.