Auto sorting on tram goes bad.

I always seem to find myself about as far from the doors of the tram as possible just when my tram stop is coming up. I'd like to do some sort of film about a tram that you speak your destination to as you board, then the tram will package you up in a soft perspex tube and move you into a line that's sorted according to which stop you are going to exit the tram. We could follow the story of a tourist or non-regular tram rider who isn't sure where he/she wants to get off the tram, and there's confusion and the tubes get mixed up and the tram gets annoyed and starts firing the passengers out like a cannon. There's mayhem and injuries. Maybe death.