I understand you completely. That song is burnt into my brain also.

I think it was the trailer for Captain America: Civil War where the music started on the same note, and every time I watched it I was just imagining Steve Rogers swaggering around to Welcome to the Black Parade (which would make strange material for a fanvid, I guess).

I have a theory that everyone who was a teenager when that song came out unknowingly has perfect pitch, as we can all recognise it from the first note. =P