To sometimes turn around and see what's behind us is one of the most natural instincts in the world. And it goes for what you literally have behind you as well as what you have behind you in a more metaphorical sense. But sometimes, you just mustn't.
For this trope to come into effect, turning back must be forbidden and/or have very bad consequences.
In drama, this is primarily a symbolic metaphor involving issues of trust and angst. However, it can also be a matter of You Do NOT Want To Know.
To avoid the whole Faux Symbolism debate, purely practical examples (such as being chased by a Medusa) are not excluded from this trope. This extends to video games that use it as a particularly brutal way of enforcing Ratchet Scrolling: Turning back kills you instantly.
Can lead to Curiosity Killed the Cast. Has nothing to do with Don't Look Down: "Back" is where you are coming from, not merely a direction opposite to where your head is facing. Also unrelated to Unflinching Walk, where you Don't Look Back at the explosion happening behind you simply because it looks cooler. Contrast with Look Behind You and compare to "I Can't Look" Gesture.
Sometimes also qualifies in fiction as an example of Schmuck Bait, as being told not to do something only increases the temptation to do so.
- Gohan does this in Dragon Ball Z just after Goku turns Super Saiyan for the first time during the battle with Frieza. While flying away, Gohan briefly turns to look back, but stops himself and keeps going, knowing he has to get Piccolo to safety.
- Bleach anime episode 168. While Division 3 is fleeing a Restrictive Current in the Precipice World, Lieutenant Izuru Kira tells his men "Don't look back". He doesn't want them to be distracted by the pursuing threat.
- At the end of Spirited Away by Hayao Miyazaki, Chihiro is forbidden to look back as she is journeying out of the spirit world. She nearly does, but conquers that temptation.
- Fullmetal Alchemist: Ed and Al burn down their house as a reminder to never turn back until they can get back to normal. Ed even keeps the date etched into his pocket watch. Hoenheim later challenges Ed on the symbolism, making him feel like a child. Generally not something you wanna do.
- In JoJo's Bizarre Adventure: Diamond is Unbreakable, Rohan and Koichi discover an alleyway in Morioh that's connected to the Afterlife and seems to be the result of Morioh's resident Serial Killer. His first victim, Reimi Sugimoto, is stuck in the alley until her murder is avenged, and acts as a sort of guide to those who wander in. She shows the pair the way out, warning them that they absolutely cannot look back or they'll be Dragged Off to Hell, and that the spirits will try to trick them; they manage to trick Koichi into turning around, but Rohan uses his Stand, Heaven's Door, to save him. Later on Rohan exploits the alleyway in order to get rid of an enemy Stand that's clinging to his back and can't be removed without killing him or foisting it off on another person. And at the end of the series, the serial killer Yoshikage Kira ends up in the alley after he's killed and subsequently gets torn to pieces by the spirit hands. The location is iconic enough that JoJo's Bizarre Adventure: All Star Battle uses it as the special finish animation for the Morioh map.
- Saint Seiya has the backstory of Silver Saint Lyra Orpheé, inspired on the myth of Orpheus: Orpheé traveled to Hell in order to save his beloved Eurydice, and played the lyre in front of Hades until, touched by his music, he allowed them to return back to the living world under the condition that he didn't look back until they were out of Hell. Unfortunately for him, Hades' caretaker/sister Pandora really liked his music, and so had one of the Spectre serving her trick him on his path out with a mirror that simulated the brightness of the Sun. Orpheé saw that and, thinking it was the Sun and they were back in the world of the living, looked back...and watched Eurydice's body became a solid rock, trapping her in Hell forever. Orpheé, out of guilt, decided to stay at her side in Hell eternally, and Pandora got him to play in Hades' court once a month.
- Invoked in Judge Dredd, during the "Apocalypse War" Story Arc, Mega-City One is ravaged by the Soviet city-state East-Meg One to the point where a massive throng of civilians (in the comic, said to be "an estimated 27 million people") are at one point seen making an exodus. One child being carried by his father looks back and says, "Bye-bye city," while his father responds, "Don't look back, boy! You might catch something!" Later, the freak weather conditions caused by the destruction of Weather Control creates hurricane conditions, which sweeps up the escaping refugees and "unceremoniously deposits them back in the city from which they fled."
- In I Can't Believe it's not the Justice League, the Superbuddies are in Hell and meet their long-deceased friend and teammate Ice. Eventually it comes to pass that the group is simply allowed to leave, and they can even take Ice with them - as long as none of them look back to make sure she's still there. Ice was Fire's best friend and the only person Guy Gardner ever truly loved - it was torture to not look. Ice says something just as they reach the end of the tunnel, and the two instinctively look back, causing her to disappear.
- In The Phantom Menace, Anakin's mother gives him the strength to leave Tatooine by telling him not to look back at her.
- In The Italian Job, Charlie Crocker fears that his girlfriend's involvement in the heist is putting her at unacceptable risk, so he buys her a plane ticket back to England. He tells her to walk straight to the plane, "Look neither to the right nor to the left," to avoid attracting attention. She, of course, turns around and shouts "Bye, Charlie!" the entire way to the plane. Nothing bad comes of this.
- Played for laughs in The Gumball Rally.
Franco: First rule of Italian driving: whats-a behind me [breaks off rear-view mirror and throws it away] is not important!
- Black Orpheus, being a retelling of the Orpheus myth. The voice of Eurydice tells Orfeo not to look back. He does anyway, and Eurydice's voice, coming from the mouth of an old woman, tells him she must now go away forever.
- Bambi: These are the last words Bambi's mother tells him as they try to evade a hunter's bullets.
"Don't look back! Keep running! KEEP RUNNING!"
- In The Divine Comedy, an angel warns Dante that anyone who looks backwards towards the entrance to Purgatory will be banished from from the mountain. In a subversion of the usual structure of this trope, Dante finds he has no interest in going back to the world of sin and death and begins his climb to Paradise.
"[I]f I’d turned toward it, how could my fault have found a fit excuse?"
- Ardneh's last message to Prince Duncan and his army at the end of The Empire of the East is not to look back as they retreat, leaving Ardneh to die. This was probably the most practical version of this advice ever given in fiction, in that the reason Ardneh did not want them looking back was that he planned for there to be a very bright light at the moment of his death, and he didn't want them to hurt their eyes.
- The novel Hell Phone by William Sleator involves the protagonist buying a used cell phone that allows him to communicate with damned souls in Hell. His subsequent actions ultimately result in him dying and being damned to Hell himself. He is able to use the phone to give himself and his companions a chance to escape, but they have to run for the exit without looking back even once, despite overwhelming temptation to do so. He makes it, the others don't.
- The Last Unicorn: When running from a freed harpy in Mommy Fortuna's Midnight Carnival, the Unicorn instructs Schmendrick not to run (you should never run from anything immortal, as it attracts their attention) and not to look back as it tears Mommy's thug to shreds.
- One of the endings of the Choose Your Own Adventure book The Mystery of Chimney Rock has you leaving the haunted house after being told by a ghostly creature never to look back at the house. Of course if you don't like that ending, you can choose to look back one last time anyway, the resulting page of which simply has a bloodcurdling scream down the page followed by a THUNK.
- "Don't Look Back" by She & Him namechecks Orpheus, and the chorus cheerfully urges the listener against this trope, as "all you'll ever get is the dust from the steps before".
- Don Henley, "Boys of Summer"
a voice inside my head said don't look backyou can never look backI thought I knew what love waswhat did I knowthose days are gone for everI should just let them go and...
- The song at the end of Shadow the Hedgehog.
- The song "Don't Look Back" by the Savannah, Georgia sludge-metal band Kylesa.
- The songs that shares their titles with this trope:
- "Right" from David Bowie's album Young Americans also has the message that it's better not to look back on your life.
Never no turning backNever, never, never
- The Book of Genesis's account of the destruction of Sodom and Gomorrah includes God's warning to Lot, his wife and daughters to not look back as they flee the cities prior to the cities' imminent destruction ("Escape for thy life; look not behind thee, neither stay thou in all the plain; escape to the mountain, lest thou be consumed" (Genesis 19:15-17)). Yet, Lot's wife does, and upon seeing the flaming ruins of Sodom and Gomorrah, is turned into a pillar of salt.
- In the gospel of Luke, Jesus Himself says those who put their hands to the plow, and then look back, are not fit for the Kingdom of God.
- The Izanagi and Izanami myth from Japanese lore. They created Japan and lots of stuff happened, but then Izanami died, and went to Yomi-tsu Kuni. Izanagi decided to go there and bring his beloved back from the land of darkness and death. Izanami greeted Izanagi from the shadows as he approached the entrance to Yomi. She warned him not to look at her and said that she would try to arrange for her release from the gods of Yomi. Full of desire for his wife, Izanagi lit a torch and looked into Yomi. Horrified to see that Izanami was a rotting corpse, Izanagi fled. Angry that Izanagi had not respected her wishes, Izanami sent hideous female spirits, eight thunder gods, and an army of fierce warriors to chase him. Izanagi managed to escape and blocked the pass between Yomi and the land of the living with a huge boulder. Izanami met him there, and they broke off their marriage.
- Orpheus of Greek Mythology wanted his dead wife back, so he visited Hades (after moving Charon and making Cerberus fall asleep with his incredible music playing). Hades agreed on the condition that Orpheus not look back until the couple were back in the living world. Sadly, Orpheus turned to look JUST as they were almost out of the Underworld, because he wanted to be sure that his wife was really behind him.
- Worse than that, some versions say he looked back AFTER he was out of Hades, but before she was (she was behind him after all).
- The Boyfriend's Death. When the girl is told to get out of the car by the police they tell her to not look back. She does, and sees either (a) the body of her boyfriend hanging down from a tree limb and scraping the roof with its fingers or (b) the madman who killed her boyfriend sitting on top of the roof and tapping it with her boyfriend's head.
- In Corpse Party (PC-98), even if you manage to escape Heavenly Host, you still have to traverse a corridor of light between worlds. Turning around or looking back leads to a very quick demise, and the evil spirits infesting the school will try and trick you into doing so.
- In Doodle Jump, the platforms stop existing as soon as they fall out of view. Thus, if you try to jump down to get a power-up you missed then there is nothing to land on - you will fall to your death.
- The game Don't Look Back (Let's Played by Deceased Crab here) is a retelling of the Orpheus myth and, in the return trip, has that as a gameplay mechanic: facing the wrong way will cause Eurydice to dissolve and necessitate the player to replay that screen from the beginning.
- In Season Two of The Walking Dead, in the ending where Clementine ends up staying in Wellington at Kenny's request, the two share a tearful goodbye as the latter tells her that once he leaves, he's not looking back but not because he wants to. He pauses momentarily while walking away, but resists the urge.
- In Sluggy Freelance Gwynn spent a long time possessed by the demon K'z'k. There would be occasional scenes during this period set in Gwynn's "inner universe" where she could be seen trudging determinedly along a road with K'z'k's avatar badgering and cajoling and trying to trick her into looking at what was following her. Gwynn steadfastly refused until K'z'k started using her body to kill her friends, showing her the events as they were unfolding and taunting her with her powerlessness to stop them. Finally, in desperation and with no other ideas, Gwynn turned around.
- The Simpsons: when Homer became head of Sanitation and ruined the environment, after the town packs up an moves away we see a Crying Indian. Another Native American then comes up to the one who cried at the single piece of litter and says "Do yourself a favor. Don't turn around." The camera pans out over the landfill where Springfield used to be, to the sound of screaming, followed by "I told you not to turn around."
- "Abraham" in Testament: The Bible in Animation plays the story of Sodom and Gomorahh straight, complete with Lot's wife looking back at the city as the family flee and being turned to salt for it.