- One particular episode revolves around a villain faking a mummy's curse to steal its treasures, revealing how he did it all in the end. Then said mummy stands up and strangles him while the survivors flee in terror. Sam leaps out before we find out how it ends.
- It's even scarier because a wall separates them from the villain and the mummy. You don't see it happen; you only hear the screams. Al is able to pass through the wall to check it out, but immediately comes running back out, saying, "He's killing him."
- There's also the episode where Sam leaps into a death row inmate with only days left before his execution. He's able to complete his mission just in time to leap out while being electrocuted in the electric chair.
- "The Boogeyman." Sam leaps into Joshua Rey, a horror novelist in The '60s, and, within just a few moments of arrival, a man falls to his death from a ladder, it having been moved by a goat which seems to appear and disappear throughout the episode, and Sam's the only one who can see it. As time passes, other characters get killed off in increasingly creepy ways and, to bring this Up to Eleven, something is writing the murders in Rey's typewriter seemingly as they occur. Then it turns out that the goat is actually Satan, who's essentially been trolling Sam throughout the episode and steadily wearing him down before taking Al's form with glowing red eyes and nearly strangling Sam in an extremely Mind Screw-ish sequence. Thankfully, Sam Beckett strangles Satan and resets the episode to the very beginning, but without the Devil causing mayhem, nobody dies this time around. And then, it turns that the allusions to horror novels from Sam's own time period has effectively inspired their own creation, because Rey's assistant is a young Stephen King.
- There was also the episode where Sam leaps into Lee Harvey Oswald. As frightening as becoming the infamous assassin is on its own, it gets worse when Sam begins to behave like Oswald did, which includes abusing his wife. Both Sam and Al are horrified by his personality changes and Sam starts feeling like he's losing his mind.
- Another episode has Sam leaping into a TV actor who plays a doctor. He gets kidnapped by an insane dysfunctional couple whom the wife is a rabid fan that can't tell the difference between TV and real life. Sam was held prisoner against his will in an isolated house in a setting no different than Misery.
- The fact that Sam may be indirectly responsible for Donald Trump winning the presidency. The fact that young Donald is sharing a car with a Latina woman is just icing on the discomfort cake.
- Stephen Colbert performed a sketch with Scott Bakula on The Late Show wherein he (in place of Al), tries to get Sam to prevent Trump from becoming president in the same episode. Even includes the costumes from the original episode, to boot! https://www.youtube.com/watch?v=R0ScMs6_I8s
- The Evil Leapers, who jump into your body or the bodies of people around you to ruin your life. And we don't even know why.
Nightmare Fuel / Quantum Leap