Seeing as someone else started talking about music (cf. Steve Miller), my kindermusiktrauma song would have to be "D.O.A." by Bloodrock from 1971. Ostensibly a song about a plane crash victim told in first person, the song starts with a Hammond organ that has some of the creepiest, deepest, dirtiest production imitating an ambulance siren. It goes on from there to a pretty basic (yet rather turgid) 3-chord progression, culminating in the chorus "I remember we were flying low and hit something in the air." Pretty graphic lyrics about a lost arm, a dead girl staring back at the narrator, and the classic climax of "Dear God in heaven, teach me how to die!"
The whole thing sounds like it was recorded on some bad b-movie set in Texas, with thuddy drums (typical for the time) overworked bass licks in the chorus, crazy deep and dramatic vocals, then – and this is what always really got me as a kid – THEY SLOW THE TAPE DOWN AT THE END OF THE SONG AND CROSSFADE TO AMBULANCE SIRENS!
I downloaded this song a few weeks ago, and it still has the same effect on me as being up late watching a Movie of the Week from the same time period.
The song made it to #36 on the Billboard charts, according to the Bloodrock Wiki entry.
I'd be curious if other folks remember this song, or have similar trauma moments (I can think of "One Tin Soldier" ("Go ahead and hate your neighbor/go ahead and cheat a friend") and the spoken word break from Stevie Wonder's "Living for the City" as two other immediate trauma inducers).