I've been thinking of making one that wasn't nightmare fuel, perhaps it's better to hand my idea off to somebody else.
I want to take all the jokes about singing in the shower, and turn them into something that isn't a joke submission.
Anybody who is in it starts to sing, and when they hear themselves they start to think the singing is good.
Anybody else who hears it, thinks the singing is good.
At first, only in the shower does it work. This is how it gets people back into the shower, memetically addicting, the sound of the song.
With further exposure the effect becomes more and more permanent. First working only in live performances, but in the final stages working even in recordings.
Oddball bit where it will try to connect itself to any water pipes it can find, breaching containment if not connected to do it. Water is always the perfect temperature, never clogs. Containment is simple, kill anybody who's ever showered in it and give a class b amnesiac to anybody who's heard the singing. Just leave it connected. Mark it as ecluid, then downgraded to safe.
Toss in a rumor that certain pop stars that seem to otherwise lack talent once lived in that building, or at least visited there.
Then wait for somebody to suggest reinstalling it in the room of the hair clog monster (because crossovers of your own are crass).
I've been thinking of making one that wasn't nightmare fuel, perhaps it's better to hand my idea off