Skeleton: WHAT IS THE WIND SPEED OF A SWELLOW? Phanphy: Wait! I saw this on TV once! I know the answer! Is it a Hoennese Swellow or an Orrean Swellow? Skeleton: HOENNESE. Phanphy: No, you were supposed to say you didn't know, then fall off a cliff. Skeleton:YOU WATCH TOO MUCH TV.
We Just Want to Help You by Jeanne Hedge is a fic where a random fan of Bubblegum Crisis finds herself in the Tokyo of 2035, hurries over to offer to help Ms. Stingray... and gets tranqed and sent to the loony bin when it turns out she's not actually inBubblegum Crisis, but a relatively close (but significantly divergent) Alternate Dimension.
ThisCode Lyoko fanfic features Jeremie using fairy tale logic to determine how his relationship with Aelita should progress.
"We call her 'Princess' all the time. Think hard, Ulrich. What story do you know of had the fair princess's hand won by an intellectual?... I can't win her, Ulrich. I can help her, get her away from XANA and Lyoko by finding the anti-virus but I can't have her heart. It's not the way the fairy tale goes.
In the My Little Pony: Friendship Is MagicFan FicThe Writing on the Wall, everyone about the ancient tomb and the titular writing on the wall. They think that they're still in an Adventurer Archaeologist story with a fantasy bent, so the tomb is full of treasure and archaological goodies and the writing is empty threats intended to scare away superstitious would-be tomb raiders. It's actually a sci-fi horror story, the building is a containment facility for something very dangerous, and the writing on the wall is an accurate and deadly serious warning to anyone who would attempt to get in.