This puts me in mind of the Thomas the Tank Engine stories.
He is guard on one of the metro trains. Finger on button, ready to play the warning jingle prior to closing the train doors.
Warning JINGLE? Down here we just get a recorded "stand clear, doors closing" plus some flashing lights for the hearing-imapaired. I like the idea of a jingle.
I like it even more if I can find a way to swap it with "Highway To The Danger Zone" from Top Gun. It may freak a few commuters out, but it would be worth it.