And then we're at the prom, which is in the beautifully decorated gym. The place is full of people dancing, and Puck, Sam, and Artie are just starting Rebecca Black's "Friday." And while it's a horrible song, their performance of it is a lot more fun than the original. There's a great little moment as they sing where Santana sees another girl wearing her dress, and she just shakes her head in shock at the impossibility of it. As the song finishes, we cut to commercials.

We come back just as Rachel starts to sing Christina Perri's "Jar of Hearts." Finn can't seem to stop staring at her while she sings, and Quinn is having to work pretty hard to ignore it. We also see that Kurt and Blaine are there, but not dancing, or even holding hands. Mercedes is looking sad at a table, until Sam comes over to ask her to dance. I also have to say, while the song is beautiful and Rachel's performance is great, this kind of bitter song hardly seems like the kind of thing the kids would want to dance to. Teenagers, with their simple minds, can be kind of literal, and I'm not sure many would relish a slow dance to a song that seems to be about how much one person has betrayed another. But maybe I'm wrong, and all the kids are into anti-love songs nowadays.

Puck tells Artie it's go time. Puck tries to get Sue to dance with him, even though there's no music. It almost works, but she looks behind her as he drags her away and she sees Artie pouring something into the punch. She grabs his arm and tells him to get to her office immediately.

In her darkened office, she points a bright light at his face and opens up an aluminum briefcase. It contains her dental tools. Artie is scared that she's going to pull his teeth. Sue: "No. That would get me sent to prison. What I am going to do is attempt to give you a simple cleaning. Which as anyone who's been to the dentist will tell you, is an excruciating affair of intense oral pain." "Excruciating affair of intense oral pain" kind of sounds like my last relationship. Artie tells her that cleanings aren't painful and asks who her dentist is. It turns out she's her own dentist. She tells him the one way to avoid the scraping of doom is to tell her who put him up to spiking the punch. He begs her to let him go, as all he wants to do is get back to the gym so he can have one dance with Brittany. Sue: "Let me get this straight? I'm trying to interrogate you, and you just told me the one thing you really want? You're the worst POW ever. John McCain is rolling over in his grave."