This is based on opinion. Please don't list it on a work's trope example list.
Nightmare Fuel / Rammstein
The lyrics to the song "Stein um Stein", which describe the process of building someone into a wall. While they're still alive. (It's a metaphor for abuse.) See for yourself here.
"Mein Teil" also deserves a mention. Partly because it's about the real-life case of Armin Meiwes — indeed, the lyrics are preceded by Meiwes' ad for a young man to be "slaughtered and then consumed" — and partly because in the middle eight, there's a noise in the background that sounds like dying screams. As if the fact it's an eerie metal song about cannibalism sung in a foreign language creepily weren't enough, read the story behind the song in excruciating detail. Yes, he really did that to his you-know-what (hence the title, 'Mein Teil', which means 'my part' in German). And if you're still not convinced as to how frightening the song is, watch the music video.Sweet dreams...
The stage show isn't any less disturbing. Till dresses up as an Evil Chef, with what looks like fresh blood running down his shoulders, smeared across his mouth, and spattered along his clothes. He shimmers, like he's covered in some mixture of sweat and grease, spends much of the song sharpening a knife with a steel and routinely grins and licks his lips at the crowd.
The song also goes on shortly after the lyrics and guitar stop. This part of the song consists of nothing but creepy wailing.
It's also told from the perspective of the guy being eaten. One set of lyrics describes how difficult it is to eat. Why? Because the blood loss is so severe that he can barely stay conscious.
Rammstein generally have either lyrics about sex or murder or both. There are two songs about plane crashes, one about an insane man shagging his decaying dead wife, "Wo Bist du?" (Where are you?) about a man searching for someone in order to knife them. Then there's "Ich Tu Dir Weh", an Obligatory Bondage Song so twisted and horrific that the German government has put it and the album on which it appears, Liebe ist für alle da, on the Index. This means it cannot be sold to minors. (to be fair, the artwork shows them killing and eating women.) And "Haifisch" (Shark) is based on the chorus of "Die Moritat von Mackier Messer" (The Ballad of Mack the Knife). Finally, there's "Wiener Blut" (Viennese Blood), which talks about the Joseph Fritzl case.
"Du Riechst So Gut" is by itself a horrifying song, being based on the book Perfume: The Story of a Murderer, but the '98 music video makes it even more unsettling, with Till playing the part of a vampire hunting down a high-life woman all the way to a castle. He manages to seduce the woman, but then kills her and takes her clothes, before transforming into a pack of wolves wreaking havoc in the ballroom. Upon escaping from the castle, the wolves are revealed to be the entire band, as the other people check out the woman's corpse. Except the woman herself has been transformed into a vampire, as the surprise ending shows.
The masks in the "Du Hast" music video are nothing short of Uncanny Valley.
The cover art of Mutter.
The weird kitchen-object face masks on the Sehnsucht cover.
"Donaukinder", based off Baia Mare cyanide spill, is also scary — both the lyrics and the music itself (with its use of extremely heavy guitars and Ethereal Choir), as typical for Rammstein.
Worse, the first phrase of the chorus translates to "Where are the children?" The singer is watching his hometown die in front of him because of a chemical spill, smelling the rotten fish and birds in the river, and it hits him-Where are my kids?
Add to that by reading up on the disaster- some call it the largest natural disaster since Chernobyl. By the time it got to the Danube (which features in the song title), the cyanide already went through at least 3 rivers big and small, and was highly diluted. The effects were felt not only in Romania, where the spill happened, but Hungary (thanks to the spill almost directly getting into 2 of Hungary's major rivers, first the Szamos then the Tisza), Serbia (via the Tisza and Danube as far as Belgrad), and even as far as Bulgaria. As for the question, the accident happened in January so no children were actually swimming in the rivers, per se, bu they could have been walking along them, and parents from all these places asked that question when seeing fish and other animals die and smelling their rivers stink- and just as the song states, the Romanian government and the mine itself denied everything and claimed ignorance for a good while. "Nobody saw what happened" indeed.
The piano version of "Mein Herz Brennt". The original song is creepy enough as it is (especially the music video for it), but just playing it with only a lone piano is just disturbing. Till's appearance in the video doesn't help matters either.
Towards the end of "Das Alte Leid", a song about the complete pointlessness of the whole cycle of birth-life-death because it only gives rise to yet more suffering, as the band keeps repeating the chorus, you can hear deep in the mix the sound of a baby crying. It goes on. And on.
"Engel". It's a song about how, if you're good, you'll rise to Heaven and become an angel... and then you get to spend the rest of eternity cold and alone, with no way out. The stage version involves a flaming cage.
Weisses Fleisch definitely deserves a mention here as well, the song is about rape told from the rapist's perspective in rather graphic detail.
"Dalai Lama" from Reise, Reise is about a plane crash. It tells the story of a child and father who are killed in the crash. The song starts by describing the child happily flying with their father for their mother's birthday, before the plane experiences a failure and starts to fall to Earth. The lyrics mordantly say that human beings were not meant to fly. The song ends by describing the child's loving father asphyxiating the child so that they don't have to experience the agony and terror of dying in a plane crash.
Reise, Reise comes in packaging designed to look like a cockpit flight recorder and has a hidden track at the start of the album of the actual Japan Airlines 123 plane crash, of which only four passengers survived. It's very, very disturbing.
The music video for "Rosenrot". Let's count the ways, shall we?
There's nothing scary at first. It starts with six monks (played by the band members) visiting a charming little village. One of the monks (played by lead singer Till Lindemann) seems to be attracted to a beautiful girl, but that's not exactly scary. Then suddenly, there's a scene of Till on the ground, with bloody injuries on his face, apparently being dragged away, interspersed with a scene of the monks self-flagellating.
Later on, it turns out that the girl apparently returns his feelings, and the two become closer. Eventually, she asks him to do her a favor. Said favor? Breaking into her house and murdering her parents. We don't see much of the actual killing, but we do see a few quick shots of the struggle inside the house. We also see some fighting through the windows, spatters of blood hitting a picture, the father's corpse, and the girl giving a Psychotic Smirk. Oh, and all this is interspersed with more footage of self-flagellation.
After the deed is done, Till comes out of the house (the interior of which is now filled with Red lighting), expecting the girl to be grateful. But her face suddenly turns angry, and she lets loose with furious yelling, while pointing at him. Suddenly, a crowd of armed townsfolk rushes towards him from the darkness, accompanied by the other monks.
The townsfolk and monks give him a No-Holds-Barred Beatdown, tie him up, put an execution hood over his head, and drag him away. Not long afterwards, he gets burned at the stake, surrounded by angry townsfolk and his former travelling companions. The kicker? The girl who seduced him is the first to throw a torch onto the woodpile.