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- Tank Vixens: The "Credulity Drive" only works if the people using it don't know how it works. That is, it's just a VCR that shows you a video of the destination and your gullibility is what makes it go.
- In Looney Tunes: Back in Action, a falling Flying Car stops just short of the ground, and Bugs notes that it had run out of gas. Then somebody breaks the cartoon logic...
Kate: It doesn't work like that!WHAM!!Bugs: Thanks, toots.
- In Bedtime Stories, the stories that the protagonist and the kids tell become reality, but when the protagonist realizes this, he loses the ability to control the stories, but the (still oblivious) kids still can. Hilarity Ensues.
- The Hitchhiker's Guide to the Galaxy. This applies to how Arthur Dent flies, or how flying works in general. He basically ignores the fact that it should be impossible, and ignores everyone else telling him it should not be happening. Lampshade Hanging this trope.
- In the Xanth novels, this is how Princess Ida's Talent works. Her Talent can make any stated idea come true, but the idea has to come from someone who doesn't know about Ida's power. Once Ida figures it out, she stops being able to generate the ideas herself, but becomes a handy Deus ex Machina for protagonists in later novels.
Live Action TV
- In the Gilligan's Island episode where Mr Howell's double has been found, spending his money, the real Howell offers the castaways a reward to get him back to the mainland. Gilligan invents a set of bird wings, for Howell to use. When he demonstrates:
Skipper: That's impossible. You can't fly!Gilligan:(who was hovering about 10 feet up) I can't?Skipper: No!Gilligan: Oh. (drops like a rock)Gilligan: Why'd you have to say that?
- Warhammer 40k
- It is explained that ork technology works only because orks aren't bright enough to realize that it should not work. They also believe that of all the vehicles, The Red Ones Go Faster. In fact, they believe it strongly enough for it to be true.
- There is one instance where an ork manages to steal a spaceship and go for a joyride around the system, even though the ship had no fuel. It worked simply because he didn't realize that he was running on empty.
- Goblins features Minmax's sword Oblivious, which took on the attributes of absolute nothingness, and technically does not exist. Minmax's incomprehension of how the sword works actually makes it stronger, since the less definite a concept it is, the more powerful it becomes.
- In Manly Guys Doing Manly Things, it's an explicit rule that the Time Travel technology works better the less you think about it. The first trip runs smoothly because Commander Badass distracts Jones immediately beforehand, so she thinks about the nonsense he said instead of about time travel. On the return journey, Commander Badass forgets, and Jones wonders how people can use Facebook to communicate across time, and disaster strikes.