In the Martial Arts episode, Penn, in a ridiculous tie-dye karate uniform, teaches his own pacifist martial arts to children that involves pouring chocolate shake all over your head.
The "Ouija Boards and Near Death Experiences" episode gets ever more ridiculous; from the ouija board that still works upside down to the people who believe their dog has been re-incarnated three times until, with perfect comic timing, Penn announces "then there's this fuckin' guy..."
Professor Best: "We didn't interview Professor Best just because of his last name but we did tell Professor Worst to go fuck himself."
The Area 51 episode has a hilarious spoof of the whole "alien conspiracy" with the Running Gag of "Box 51" in which Penn claims a box Teller is holding contains Hitler's brain due to Teller neither denying or confirming said brain is in the box.
Penn: (Box begins to twitch) Not only does Box 51 contain Hitler's brain, but it can dance! (smoke emits from the box and lights flash from inside as well) And it's on fire!
And then in the Conspiracy Theories episode, Penn and Teller depict what it would look like if the Apollo moon landings were staged on movie sets as conspiracy theorists claim.
Penn: CUT! Jesus fucking Christ, Neil! How many times do we have to try this? "One small step for A man", not man. A man! And that's YOU! Everybody take five. Neil, practice your fucking lines! [to Teller] Ooh yeah, let's use real pilots. I wanna use real pilots! [to the camera] Faking the Moon Landing is easy. You need dirt, wardrobe, a sound stage, a lot of black paints, and some stupid suits. The hard part is shutting people up. It's been 36 years!note The episode was recorded in 2005. You'd think the technicians, and prop people, camera people, directors, everyone who works at NASA, and the Jet Propulsion Lab in Pasadena, and all the nice folks at Cape Carnaval in Florida, plus members of the US Congress and the White House all shut up about this amazing cover-up for all that time? The Government couldn't even fucking cover up a break-in to a psychiatrist's office in a fucking cheesy hotel! Watergate is the answer to all this shit. If they couldn't cover that up, they fucking can't do anything.
In the Video Games episode, one guy claims that FPS's "train" kids to shoot. They wordlessly tear apart the idea that mainstream video games can train you for anything by showing Teller calmly playing Wii Tennis, then having a real tennis player hand him a racket and serve him a ball. It doesn't even look like Teller sees the ball.