As an English teacher (and one who teaches Brave New World) I am loving the previous responses. Back to the original topic...
Not being able to differentiate between fantasy and reality can be an issue with the martial arts because much of what is taught is based on theory. Theoretically the (insert random technique) should work in a fight but if you've never used it in a real situation you can't be completely sure. Reality can be further blurred by the popularity of MMA, as fans may think that a match between two highly skilled, well trained professional athletes is the same as an unsuspecting person being the victim of an attack on the street. Another issue with many high-ranking martial artists is that they come across as authority figures without ever having gone through actual self defense situations. The reality for some may not be the reality for others. BJJ grapplers will say that their art is the best for self defense, although many bouncers and security personnel will say that they would never want to fight on the ground. Many martial arts teach kicks but a police officer that I talk to says that he's never had an attacker try to kick him. His experience may be different than other police officer's experience, though, which shows that there isn't a "one true reality" for the street.
At times, as martial artists, we have to suspend reality (like when learning a cool new technique that may not be realistic for the street.) Some study martial arts for the "art" aspect and some study it for self defense. I love Tang Soo Do (my first Black Belt) but it has a completely different philosophy to self defense than Krav Maga (my most recent Black Belt.) There is a lot of "suspending reality" in the martial arts, which can include telling and listening to stories that may be embellished (or completely made up.) I remember hearing a story about a fight that my instructor was in, only to hear the same story from a guest instructor, and then the same story from other higher ranking Black Belts later on. Which instructor was actually involved in the encounter? Probably none of them, but they were trying to make a point with the story.
Imagine this scenario:
Instructor: "Here is a defense against a (insert attack here)"
Student: "Have you used it on the street?"
Instructor: "No."
Student: "Then how do I know it works?"
Instructor: "Um, because my instructor taught it to me."
Student: "So, he (or she) has used it on the street?"
Instructor: "Uh, I don't know."
Student: "So how do you know it really works?"
Instructor: "Um..."
My point is that, as martial artists, we belong to a group that is mostly built upon theory and fantasy...or at least the suspension of reality at times. If we relied completely on our own real experience as truth, most of us here wouldn't have enough truth to test out of white belt. I have been in three fights, which is three more than most, and I can confidently say that meeting your knee to an opponent's roundhouse kick will break his leg, headbutting from underneath someone's jaw can stop someone from continuing a fight, and parrying enough punches until someone gets frustrated and walks away can work. That's my reality. Other than that I have to rely on theory and stories that others have told me...many of which are fantasy but are used to teach a point.
I am curious what we'd get if we put together a thread that only included self defense moves that we've actually used ourselves in real encounters (and not is high intense sparring sessions and not ones we saw on Youtube.) I would imagine that we would still get fantasy because people, by nature, want to be included. If we were completely honest with ourselves, and don't work in the law enforcement or security field, I would imagine that the list would be very small.